CN112116848B - University student's innovation venture education teaching equipment - Google Patents
University student's innovation venture education teaching equipment Download PDFInfo
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- CN112116848B CN112116848B CN202010697545.8A CN202010697545A CN112116848B CN 112116848 B CN112116848 B CN 112116848B CN 202010697545 A CN202010697545 A CN 202010697545A CN 112116848 B CN112116848 B CN 112116848B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
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Abstract
The invention provides university student innovation and entrepreneur education and teaching equipment which comprises a case and a display box arranged above the case, wherein the display box comprises two first display rooms and a second display room, a rotary display platform, a mounting box, an adjustable bearing component, an adjustable limiting component, an angle adjusting mechanism and a locking mechanism are arranged inside each of the first display room and the second display room, the rotary display platform is provided with the mounting box and a first adjusting guide frame, the distance between the adjustable bearing components in the two mounting boxes is adjustable, a plurality of height-adjustable bearing components are arranged on the adjustable bearing components in parallel along the length direction of the adjustable bearing components, the rotary display platform is further provided with two symmetrically-arranged adjustable limiting components, and the distance between the adjustable limiting components in the two second adjusting guide frames is adjustable. This teaching equipment is convenient for compare the analysis when teaching, does benefit to the student and obtains the innovation material through analytical study, and the showpiece is difficult to lose moreover and damages, the bandwagon effect is good.
Description
Technical Field
The invention relates to the technical field of innovation teaching, in particular to university student innovation entrepreneurship education teaching equipment.
Background
The creativity of the people is the greatest cost for development, more than 700 million graduates of colleges and universities exist in China every year, the number of people reading college students reaches 2610 ten thousand, and the creative education of the college students starts in a large range; colleges and universities serve as culture bases of students, in order to stimulate new innovation kinetic energy, college students can obtain corresponding knowledge through comparison by displaying some success cases during lectures, and the conventional method enables the college students to directly contact with a model, so that the model is limited in use frequency, and is damaged or lost after being used for many times, the teaching cost is extremely high, and the college student innovation and entrepreneur education teaching equipment is provided.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides the university student innovation entrepreneur education teaching equipment, facilitates comparison and analysis during teaching, is beneficial to students to obtain innovation materials through analysis and research, is not easy to lose and damage exhibits, and has a good exhibition effect.
In order to achieve the purpose, the invention provides university student innovation and creation education and teaching equipment which comprises a case and a display box arranged above the case, wherein the display box comprises a first display room and a second display room which are used for displaying a model respectively, a rotary display platform, an installation box, an adjustable bearing component, an adjustable limiting component, an angle adjusting mechanism and a locking mechanism are arranged in the first display room and the second display room respectively, the rotary display platform is rotatably arranged on an annular guide rail above the case, two symmetrically-arranged installation boxes are arranged on the rotary display platform, first adjusting guide frames which are symmetrically arranged are arranged on two sides of each installation box, two ends of the adjustable bearing component are movably arranged on the first adjusting guide frames, the distance between the adjustable bearing components in the two installation boxes is adjustable, a plurality of height-adjustable bearing components are arranged on the adjustable bearing components in parallel along the length direction of the adjustable bearing components, two second adjusting guide frames which are symmetrically arranged on the rotary display platform are also arranged on the rotary display platform, the adjustable limiting components are arranged between the two second adjusting guide frames, an adjusting guide frame is arranged on the rotary display box and a rotating mechanism used for adjusting the distance between the two adjustable bearing components, and a locking mechanism is arranged below the adjustable limiting components.
Preferably, the adjustable bearing component further comprises a first movable frame, a first guide adjusting groove, a first fastening screw, a first sliding block and a first adjusting nut, the first guide adjusting groove of the plurality of is arranged in the length direction of the first movable frame at intervals, the bearing component is movably mounted in the first guide adjusting groove, the height direction adjusting position of the first guide adjusting groove can be adjusted along the height direction, the first fastening screw is symmetrically arranged on two sides of the first guide adjusting groove, the end portion of the first fastening screw penetrates through the first movable frame and extends into the first guide adjusting groove, the end portion of the first fastening screw abuts against the side wall of the bearing component and is used for locking the bearing component, first sliding blocks are symmetrically arranged at two ends of the first movable frame, a first sliding cavity is formed in the first guide frame, a first bar-shaped groove is formed in the top of the first sliding cavity, the first sliding block is movably mounted in the first sliding cavity, the first screw is arranged on the first sliding block, the top of the first screw penetrates through the first bar-shaped groove, and the first adjusting nut is mounted on the first sliding block and is used for locking the first sliding block.
As preferred, the bearing subassembly includes dead lever, movable rod, first spring and elasticity block, install in first direction adjustment tank the lower extreme of dead lever, the upper end of dead lever has flexible chamber, the lower extreme of movable rod is fixed in flexible intracavity through first spring, and the upper end of movable rod is equipped with the elasticity block, the outer wall and the top of elasticity block are equipped with anti-skidding line.
Preferably, the adjustable limiting assembly further comprises a second movable frame, a blocking frame assembly and a second adjusting nut, a second guide adjusting groove is formed in the second movable frame, the blocking frame assembly is movably mounted in the second guide adjusting groove, a second fastening screw is arranged on one side of the second movable frame, the end portion of the second fastening screw penetrates through the second guide adjusting groove and abuts against the blocking frame assembly, second sliding blocks are symmetrically arranged at two ends of the second movable frame, a second sliding cavity for the second sliding block to move is formed in the second adjusting guiding frame, a second strip-shaped groove is formed in the top of the sliding cavity, a second screw is arranged on the second sliding block, the top of the second screw penetrates through the second strip-shaped groove, and the second adjusting nut is mounted on the second screw and used for locking the second sliding block.
Preferably, the blocking frame assembly comprises a supporting rod and a plurality of ejector rods arranged on the supporting rod, the ejector rods are in threaded connection with the supporting rod, a hexagonal driving head is arranged at one end of each ejector rod, and an elastic ejector cap is arranged at the other end of each ejector rod.
Preferably, the angle adjusting mechanism comprises a driving shaft and a driven shaft, the driven shaft is perpendicular to the axis of the driving shaft, one end of the driving shaft is meshed with a driven bevel gear at the lower end of the driven shaft through a driving bevel gear, a hand wheel is arranged at the other end of the driving shaft, and the upper end of the driven shaft is connected with the center of the rotary display stand.
Preferably, the locking mechanism comprises a driving rod, a locking slide rod, a limiting bolt and a second spring, the driving rod is installed on the side wall of the case, a knob is arranged at one end of the driving rod, the other end of the driving rod is inserted into a circular truncated cone driving body arranged inside the case, a mounting cavity is formed in the upper portion of the case, the locking slide rod is movably installed in the mounting cavity, a hemispherical driving portion matched with the circular truncated cone driving body is arranged at the bottom of the locking slide rod, a limiting groove is formed in one side of the locking slide rod along the axis direction of the locking slide rod and matched with the limiting bolt, one end of the second spring is connected with a top plate at the top of the locking slide rod, the other end of the second spring is connected with the mounting cavity, and anti-skidding insection is arranged on the upper end face of the top plate.
The invention has the beneficial effects that: according to the invention, through arranging the two display rooms, comparison can be carried out on different exhibits, the same product can be placed, and different positions are displayed, so that comparison and analysis during teaching are facilitated, and students can obtain innovative materials through analysis and research. In addition, a rotary display platform, a mounting box, an adjustable supporting component, an adjustable limiting component, an angle adjusting mechanism, a locking mechanism and the like are arranged in the two display rooms, wherein the adjustable supporting component can be adjusted according to different articles to be displayed, a product with a non-planar bottom surface can be stably placed, the adaptability is stronger, and a better display effect is achieved; the angle adjustment mechanism can adjust the display surface of the exhibit, is convenient to operate, and students and teachers do not need to frequently adjust the positions of the students and the teachers during teaching, so that the students and the teachers can conveniently observe the exhibit.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an university student innovation and entrepreneurship education teaching device of the present invention;
FIG. 2 is an enlarged schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic top view of the internal structure of FIG. 1;
FIG. 4 is an enlarged view of the structure at C in FIG. 3;
FIG. 5 is a schematic cross-sectional view along line AA of FIG. 3;
FIG. 6 is an enlarged view of the structure of FIG. 5;
FIG. 7 is a schematic structural view of a supporting member of the innovative entrepreneur education and teaching apparatus for college students according to the present invention;
fig. 8 is a schematic structural diagram of a blocking frame assembly of the university student innovation and entrepreneur education and teaching equipment of the present invention.
Detailed Description
Referring to fig. 1 to 8, the university student innovation and creation education and teaching device of the present invention includes a case 10 and a display box 20 disposed above the case 10, where the display box 20 includes a first display room 201 and a second display room 202 for displaying a model 100, the first display room 201 and the second display room 202 are provided with a rotary display stand 1, an installation box 2, an adjustable bearing component 3, an adjustable limiting component 4, an angle adjusting mechanism 5, and a locking mechanism 6, respectively, the rotary display stand 1 is rotatably mounted on a circular guide rail 101 above the case 10, the rotary display stand 1 is provided with two symmetrically arranged installation boxes 2, two sides of each installation box 2 are provided with symmetrically arranged first adjusting guide frames 21, two ends of the adjustable bearing component 3 are movably mounted on the first adjusting guide frames 21, a distance between the adjustable bearing components 3 in the two installation boxes 2 is adjustable, a plurality of height-adjustable bearing components 34 are arranged in parallel on the adjustable bearing component 3 along a length direction thereof, the rotary display stand 1 is further provided with two symmetrically arranged second adjusting guide frames 12, and an adjusting mechanism 12 is disposed below the adjustable guide frames 1 for adjusting the adjustable limiting component 12, and the adjustable limiting mechanism 12 is provided for adjusting a distance between the adjustable bearing components 12, and the adjustable guide frame 2 is provided for adjusting mechanism 12. Of course, the number of the adjustable supporting components 3 mounted in each mounting box 2 is not limited to one, and a plurality of adjustable supporting components 3 can be mounted as required, so that the supporting stability is improved.
Further, referring to fig. 4, the adjustable bearing component 3 further includes a first movable frame 31, a first guide adjusting groove 32, a first fastening screw 33, a first slider 35, and a first adjusting nut 36, the first movable frame 31 is provided with a plurality of first guide adjusting grooves 32 at intervals in the length direction, the bearing component 34 is movably mounted in the first guide adjusting groove 32, the position of the bearing component can be adjusted in the height direction of the first guide adjusting groove 32, the first fastening screws 33 are symmetrically arranged on both sides of the first guide adjusting groove 32, the end of the first fastening screw 33 penetrates through the first movable frame 31 and extends into the first guide adjusting groove 32, and abuts against the side wall of the bearing component 34 to lock the bearing component 34, the first slider 35 is symmetrically arranged at both ends of the first movable frame 31, a first sliding cavity is formed in the first adjusting guide frame 21, a first strip-shaped groove 211 is formed in the top of the first sliding cavity, the first slider 35 is movably mounted in the first sliding cavity, the first slider 35 penetrates through the first adjusting groove 211, and the first adjusting nut 36 is mounted on the first sliding cavity to lock the first sliding cavity. Specifically, referring to fig. 7, the supporting assembly 34 includes a fixed rod 341, a movable rod 342, a first spring 343 and an elastic cap 344, the lower end of the fixed rod 341 is installed in the first guide adjustment groove 32, the upper end of the fixed rod 341 has a telescopic cavity 3410, the lower end of the movable rod 342 is fixed in the telescopic cavity 3410 through the first spring 343, the upper end of the movable rod 342 is provided with the elastic cap 344, and the outer wall and the top end of the elastic cap 344 are provided with anti-slip threads. Through setting up movable rod 342, elasticity block 344 can be guaranteed to first spring and the showpiece down terminal surface offsets, and convenient the regulation can improve the stability of supporting.
Further, referring to fig. 4, the adjustable limiting assembly 4 further includes a second movable frame 41, a blocking frame assembly 42 and a second adjusting nut 43, a second guiding adjusting groove is formed in the second movable frame 41, the blocking frame assembly 42 is movably installed in the second guiding adjusting groove, a second fastening screw 412 is arranged on one side of the second movable frame 41, an end portion of the second fastening screw 412 penetrates through the second guiding adjusting groove and abuts against the blocking frame assembly 42, second sliding blocks 411 are symmetrically arranged at two ends of the second movable frame 41, a second sliding cavity for the second sliding block 411 to move is formed in the second adjusting guiding frame 12, a second strip-shaped groove 13 is formed above the sliding cavity, a second screw is arranged on the second sliding block 411, the top portion of the second screw penetrates through the second strip-shaped groove 13, and the second adjusting nut 43 is installed on the second screw to lock the second sliding block 411. Specifically, referring to fig. 8, the blocking frame assembly 42 includes a support rod 421 and a plurality of push rods 422 mounted on the support rod 421, the push rods 422 are connected to the support rod 421 by screw threads, one end of the push rods 422 has a hexagonal driving head 423, and the other end has an elastic push cap 424.
Further, referring to fig. 5, the angle adjusting mechanism 5 includes a driving shaft 51 and a driven shaft 52, the driven shaft 52 is perpendicular to the axis of the driving shaft 51, one end of the driving shaft 51 is engaged with a driven bevel gear at the lower end of the driven shaft 52 through a driving bevel gear, the other end of the driving shaft 51 is provided with a hand wheel 511, and the upper end of the driven shaft 52 is connected with the center of the rotary display stand 1.
Further, referring to fig. 6, the locking mechanism 6 includes a driving rod 61, a locking slide rod 62, a limiting bolt 63 and a second spring 64, the driving rod 61 is installed on a side wall of the chassis 10, one end of the driving rod 61 has a knob 612, the other end of the driving rod 61 is inserted into the interior of the chassis 10 and is provided with a circular truncated cone driving body 611, an installation cavity is opened above the chassis 10, the locking slide rod 62 is movably installed in the installation cavity, a hemispherical driving portion matched with the circular truncated cone driving body 611 is arranged at the bottom of the locking slide rod 62, a limiting groove 622 is opened at one side of the locking slide rod 62 along the axial direction thereof, the limiting groove 622 is matched with the limiting bolt 63, one end of the second spring 64 is connected with a top plate 621 at the top of the locking slide rod 62, the other end of the second spring is connected with the installation cavity, and an anti-slip insection is arranged on the upper end surface of the top plate 621.
Further, referring to fig. 5 and 6, the rotary display platform 1 is a circular platform, an annular sliding seat 11 adapted to the annular guide rail 101 is disposed on an outer ring of the rotary display platform, a first through cavity 102 for the installation box 2 and the angle adjusting mechanism 5 to penetrate through is disposed above the case 10, and the first through cavity 102 is located right below the rotary display platform 1.
Further, referring to fig. 1, the bottom of the chassis 10 is provided with a plurality of traveling wheels 103, the first display room 201 and the second display room 202 have the same structure and are symmetrically arranged, the second display room 202 includes a translation slide rail 203, a movable glass door 204, a door lock 205, a fixed glass side plate 206, a glass top cover 207, a fixed glass rear wall plate and a fixed frame, the front sides of the first display room 201 and the second display room 202 are provided with the movable glass door 204, the movable glass door 204 can move along the translation slide rail 203 in the horizontal direction, the door lock 205 is installed on one side of the fixed glass side plate 206, and one side of the movable glass door 204 is installed with a latch hook adapted to the door lock 205.
The working process of the invention is as follows:
the invention relates to a teaching device for university student innovation and entrepreneur education, which is characterized in that before teaching, exhibits are put into a display room, and the following operations are carried out: firstly, the movable glass door 204 is opened, the distance between the two adjustable supporting components 3 is adjusted according to the requirement, and the first movable frame 31 is locked by screwing the first adjusting nut 36 after the adjustment; then, the heights of the plurality of supporting components 34 are adjusted, after the adjustment is finished, the exhibit is placed on the adjustable supporting component 3, and the supporting component 34 below the exhibit is adjusted again, so that the elastic cap 344 of the supporting component is abutted against the lower end face of the exhibit, and the supporting stability is improved; then the adjustable limiting components 4 on the two sides are adjusted to the side where the exhibit is located, the locking is carried out through the second adjusting nut 43, and finally the position of the ejector rod 422 is adjusted, so that the two sides of the exhibit of the elastic ejector cap 424 are abutted. Fig. 1 shows two different display surfaces for displaying the same model, which is convenient for observation, and of course, different exhibits can be placed in two display rooms for comparison. During teaching, the hand wheel 511 can be rotated to rotate the rotary display stand 1 as required, so that the operation is convenient. And the top plate 621 at the top of the locking slide bar 62 is pressed against the rotary display stand 1 by rotating the knob 612, so as to lock the rotary display stand 1.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (3)
1. The utility model provides an university student's innovation entrepreneurship education teaching equipment which characterized in that: the adjustable display box comprises a case (10) and a display box (20) arranged above the case (10), wherein the display box (20) comprises a first display room (201) and a second display room (202) which are respectively used for displaying a model (100), the first display room (201) and the second display room (202) are internally provided with a rotary display platform (1), an installation box (2), an adjustable bearing component (3), an adjustable limiting component (4), an angle adjusting mechanism (5) and a locking mechanism (6), the rotary display platform (1) is rotatably arranged on an annular guide rail (101) above the case (10), the rotary display platform (1) is provided with two symmetrically arranged installation boxes (2), the two sides of each installation box (2) are respectively provided with a first adjusting guide frame (21) which is symmetrically arranged, the two ends of the adjustable bearing component (3) are movably arranged on the first adjusting guide frame (21), the distance between the bearing components (3) in the two installation boxes (2) is equal to each other, the adjustable bearing components (3) are arranged in the length direction, a plurality of adjustable bearing components (34) are arranged in parallel on the adjustable bearing components (3), and the adjustable bearing components (12) are also arranged on the second adjusting guide frames (12), the second adjusting guide frame (12) is arranged between the two installation boxes (2), two ends of the adjustable limiting component (4) are movably arranged on the second adjusting guide frame (12) and used for adjusting the distance between the adjustable limiting components (4) in the two second adjusting guide frames (12), an angle adjusting mechanism (5) for driving the rotary display stand (1) to rotate and a locking mechanism (6) for locking the rotary display stand (1) are arranged below the rotary display stand (1); the adjustable bearing component (3) further comprises a first movable frame (31), a first guide adjusting groove (32), a first fastening screw (33), a first sliding block (35) and a first adjusting nut (36), wherein a plurality of first guide adjusting grooves (32) are arranged at intervals in the length direction of the first movable frame (31), the bearing component (34) is movably mounted in the first guide adjusting grooves (32) and can adjust the position along the height direction of the first guide adjusting grooves (32), the first fastening screws (33) are symmetrically arranged on two sides of the first guide adjusting grooves (32), the end portion of each first fastening screw (33) penetrates through the first movable frame (31) and extends into the corresponding first guide adjusting groove (32) and is abutted against the side wall of the bearing component (34) to lock the bearing component (34), the first sliding blocks (35) are symmetrically arranged at two ends of the first movable frame (31), a first sliding cavity is formed in the first adjusting guide frame (21), a first sliding block (211) is arranged at the top of the first sliding cavity, the first sliding block (35) is mounted on the first sliding block (211), and the first adjusting screw (211) penetrates through the first sliding block (211), and the first adjusting screw (211); the adjustable limiting assembly (4) further comprises a second movable frame (41), a blocking frame assembly (42) and a second adjusting nut (43), a second guide adjusting groove is formed in the second movable frame (41), the blocking frame assembly (42) is movably installed in the second guide adjusting groove, a second fastening screw (412) is arranged on one side of the second movable frame (41), the end portion of the second fastening screw (412) penetrates through the second guide adjusting groove to abut against the blocking frame assembly (42), second sliding blocks (411) are symmetrically arranged at two ends of the second movable frame (41), a second sliding cavity for the second sliding blocks (411) to walk is formed in the second adjusting guide frame (12), a second strip-shaped groove (13) is formed above the sliding cavity, a second screw is arranged on the second sliding block (411), the top portion of the second screw penetrates through the second strip-shaped groove (13), and the second adjusting nut (43) is installed on the second screw and used for locking the second sliding blocks (411); the baffle frame assembly (42) comprises a supporting rod (421) and a plurality of ejector rods (422) arranged on the supporting rod (421), the ejector rods (422) are in threaded connection with the supporting rod (421), a hexagonal driving head (423) is arranged at one end of each ejector rod (422), and an elastic ejector cap (424) is arranged at the other end of each ejector rod (422); locking mechanical system (6) are including actuating lever (61), locking slide bar (62), spacing bolt (63) and second spring (64), actuating lever (61) are installed on the lateral wall of quick-witted case (10), and actuating lever (61) one end has knob (612), and the other end inserts quick-witted case (10) inside round platform driving body (611) that is equipped with, the installation cavity has been seted up to the top of quick-witted case (10), and locking slide bar (62) movable mounting is in the installation cavity, the bottom of locking slide bar (62) is equipped with the hemisphere drive division with round platform driving body (611) matched with, spacing groove (622) have been seted up along its axis direction to one side of locking slide bar (62), and spacing groove (622) cooperate with spacing bolt (63), the one end of second spring (64) links to each other with roof (621) at locking slide bar (62) top, and the other end is connected with the installation cavity, the up end of roof (621) is equipped with anti-skidding insection.
2. The college student innovation startup education teaching device of claim 1 wherein: the bearing component (34) comprises a fixing rod (341), a movable rod (342), a first spring (343) and an elastic cover cap (344), the lower end of the fixing rod (341) is installed in a first guide adjusting groove (32), a telescopic cavity (3410) is formed in the upper end of the fixing rod (341), the lower end of the movable rod (342) is fixed in the telescopic cavity (3410) through the first spring (343), the elastic cover cap (344) is arranged at the upper end of the movable rod (342), and anti-skidding threads are arranged on the outer wall and the top end of the elastic cover cap (344).
3. The college student innovation entrepreneur education and teaching equipment of claim 1, characterized in that: the angle adjusting mechanism (5) comprises a driving shaft (51) and a driven shaft (52), the driven shaft (52) is perpendicular to the axis of the driving shaft (51), one end of the driving shaft (51) is meshed with a driven bevel gear at the lower end of the driven shaft (52) through a driving bevel gear, a hand wheel (511) is arranged at the other end of the driving shaft (51), and the upper end of the driven shaft (52) is connected with the center of the rotary display table (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010697545.8A CN112116848B (en) | 2020-07-20 | 2020-07-20 | University student's innovation venture education teaching equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010697545.8A CN112116848B (en) | 2020-07-20 | 2020-07-20 | University student's innovation venture education teaching equipment |
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| CN112116848A CN112116848A (en) | 2020-12-22 |
| CN112116848B true CN112116848B (en) | 2023-01-31 |
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| JP2014041309A (en) * | 2012-08-23 | 2014-03-06 | Canon Inc | Image display device |
| CN207037978U (en) * | 2017-05-03 | 2018-02-23 | 中职北方智扬(北京)教育科技有限公司 | A kind of vehicle teaching element fixing device |
| CN210138013U (en) * | 2019-05-15 | 2020-03-13 | 大连博涛文化科技股份有限公司 | Rotary ladder exhibition stand |
| CN210810206U (en) * | 2019-09-05 | 2020-06-23 | 江西郑琳展示设备制造有限公司 | Commodity display cabinet convenient to adjust |
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