TWM492804U - Surface curved grinding wheel - Google Patents
Surface curved grinding wheel Download PDFInfo
- Publication number
- TWM492804U TWM492804U TW103213588U TW103213588U TWM492804U TW M492804 U TWM492804 U TW M492804U TW 103213588 U TW103213588 U TW 103213588U TW 103213588 U TW103213588 U TW 103213588U TW M492804 U TWM492804 U TW M492804U
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- Taiwan
- Prior art keywords
- grinding wheel
- abrasive
- grinding
- panel
- wheel unit
- Prior art date
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- 239000010432 diamond Substances 0.000 claims description 16
- 229910003460 diamond Inorganic materials 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims 1
- 238000005498 polishing Methods 0.000 description 20
- 239000003292 glue Substances 0.000 description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical group C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Description
本新型關於一種研磨砂輪，特別是關於一種用以研磨面板之曲面研磨砂輪。The present invention relates to a grinding wheel, and more particularly to a curved grinding wheel for grinding a panel.
一般之手機、手錶、平板電腦等物品，皆會於其頂面設有一透明的面板，用以保護該些物品的內部機件。面板通常是選擇以例如玻璃、石英、藍寶石或陶瓷等高硬度的材料製成。上述面板材料經切割形成面板時，會於其各相鄰面的接角形成銳利的邊緣。必須以研磨砂輪將該些銳利的接角研磨消除，以避免該些銳利接角刮傷人體或其他機件。In general, mobile phones, watches, tablets and other items will have a transparent panel on the top surface to protect the internal parts of the items. The panels are typically made of a high hardness material such as glass, quartz, sapphire or ceramic. When the panel material is cut to form a panel, sharp edges are formed at the corners of its adjacent faces. These sharp corners must be removed with a grinding wheel to avoid scratching the human body or other parts.
習知的研磨砂輪通常僅為單一的研磨單元，其具有一基座環與設於該基座環之外周的一研磨件。其中，基座環以一金屬例如鐵製成，而研磨件則以鑽石粒製成。研磨件具有一錐形研磨面，用以研磨面板的接角。Conventional grinding wheels are typically only a single grinding unit having a susceptor ring and an abrasive member disposed on the periphery of the susceptor ring. Among them, the susceptor ring is made of a metal such as iron, and the abrasive part is made of diamond granules. The abrasive member has a tapered abrasive surface for abrading the corners of the panel.
然而，上述習知的研磨砂輪於使用時有如下之缺憾：(一)、以錐形的研磨面研磨面板的接角時，雖可將該接角研磨成斜面，但是該斜面與面板的表面之間仍會存在著銳利的二次接角；(二)、其儘具單一的研磨面，亦即其研 磨面之鑽石粒的粒度係為固定，無法對面板分別進行粗磨及細磨的研磨加工，降低加工品質。However, the conventional grinding wheel has the following disadvantages when used: (1) When the joint angle of the panel is polished by the tapered polishing surface, the joint may be ground into a slope, but the slope and the surface of the panel There will still be sharp secondary joints between them; (2), it has a single abrasive surface, that is, its research The grain size of the ground diamond is fixed, and it is impossible to perform rough grinding and fine grinding on the panel to reduce the processing quality.
本新型提供一種面板之曲面研磨砂輪，可以將面板研磨出曲面的邊緣，且可以對面板分別進行粗磨及細磨的研磨加工。The invention provides a curved grinding wheel of a panel, which can grind the panel out of the edge of the curved surface, and can perform rough grinding and fine grinding on the panel respectively.
根據本新型之一態樣，提供一種面板之曲面研磨砂輪，其包括：一第一研磨砂輪單元，具有一第一基座環與設於該第一基座環之外周的一第一研磨件，該第一研磨件具有一第一曲面研磨部；以及一第二研磨砂輪單元，疊置結合於第一研磨砂輪單元，第二研磨砂輪單元具有一第二基座環與設於該第二基座環之外周的至少一第二研磨件，該第二研磨件具有一第二曲面研磨部。According to one aspect of the present invention, a curved surface grinding wheel of a panel is provided, comprising: a first grinding wheel unit having a first susceptor ring and a first grinding member disposed on an outer circumference of the first susceptor ring The first abrasive member has a first curved surface grinding portion; and a second abrasive grinding wheel unit stacked and coupled to the first abrasive grinding wheel unit, the second abrasive grinding wheel unit having a second pedestal ring and the second grinding ring unit At least one second abrasive member on the outer circumference of the susceptor ring, the second abrasive member having a second curved surface grinding portion.
根據本新型的一實施例，第一研磨砂輪單元與第二研磨砂輪單元以至少一結合件相互疊置結合。According to an embodiment of the present invention, the first grinding wheel unit and the second grinding wheel unit are superposed on each other with at least one coupling member.
根據本新型的一實施例，結合件為一膠劑結合件，其結合於第一研磨砂輪單元與第二研磨砂輪單元的相鄰面之間。According to an embodiment of the invention, the coupling member is a glue joint that is coupled between the first grinding wheel unit and the adjacent face of the second grinding wheel unit.
根據本新型的一實施例，結合件為一螺栓結合件，其貫穿結合於第一研磨砂輪單元與第二研磨砂輪單元。According to an embodiment of the present invention, the coupling member is a bolt coupling that is coupled to the first grinding wheel unit and the second grinding wheel unit.
根據本新型的一實施例，第二研磨件的表面較第一研磨件的表面為細。According to an embodiment of the invention, the surface of the second abrasive member is thinner than the surface of the first abrasive member.
根據本新型的一實施例，第一基座環為鐵製基 座環，而第二基座環為鋁製基座環。According to an embodiment of the invention, the first susceptor ring is an iron base The seat ring and the second base ring is an aluminum base ring.
根據本新型的一實施例，第一研磨件為以金屬粉末及鑽石粒燒結而成的研磨件，或以鑽石粒電鍍而成的研磨件；第二研磨件為以金屬粉末及鑽石粒燒結而成的研磨件，或以鑽石粒電鍍而成的研磨件。According to an embodiment of the present invention, the first abrasive member is an abrasive member sintered from metal powder and diamond particles, or an abrasive member plated with diamond particles; and the second abrasive member is sintered by metal powder and diamond particles. An abrasive piece, or an abrasive piece plated with diamond particles.
根據本新型的一實施例，第一研磨件在位於第一曲面研磨部的相對側具有一第一導角研磨部，第二研磨件在位於第二曲面研磨部的相對側具有一第二導角研磨部。According to an embodiment of the present invention, the first abrasive member has a first lead angle grinding portion on the opposite side of the first curved surface grinding portion, and the second polishing member has a second guide on the opposite side of the second curved surface polishing portion. Angular grinding section.
根據本新型的一實施例，第一研磨砂輪單元及第二研磨砂輪單元設有輻射狀間隔排列之上下貫通的多數道排屑溝。According to an embodiment of the present invention, the first grinding wheel unit and the second grinding wheel unit are provided with a plurality of ball flutes arranged radially above and below the radial spacing.
依據本新型面板之曲面研磨部。可以將面板的表面研磨出曲面的邊緣，且可以對面板的邊緣分別進行粗磨及細磨的研磨加工，以獲得良好的研磨品質。According to the curved surface grinding portion of the novel panel. The surface of the panel can be ground to the edge of the curved surface, and the edges of the panel can be roughly ground and finely ground to obtain good grinding quality.
100‧‧‧第一研磨砂輪單元100‧‧‧First grinding wheel unit
110‧‧‧第一基座環110‧‧‧First pedestal ring
120‧‧‧第一研磨件120‧‧‧First abrasive parts
121‧‧‧第一曲面研磨部121‧‧‧First curved surface grinding department
122‧‧‧第一導角研磨部122‧‧‧First lead angle grinding department
200‧‧‧第二研磨砂輪單元200‧‧‧Second grinding wheel unit
210‧‧‧第二基座環210‧‧‧Second susceptor ring
220‧‧‧第二研磨件220‧‧‧Second grinding parts
221‧‧‧第二曲面研磨部221‧‧‧Second curved surface grinding department
222‧‧‧第二導角研磨部222‧‧‧Second Guide Angle Grinding Department
300‧‧‧結合件300‧‧‧Connected parts
310‧‧‧膠劑結合件310‧‧‧ glue joints
320‧‧‧螺栓結合件320‧‧‧Bolt joints
400‧‧‧排屑溝400‧‧‧Ditching
500‧‧‧面板500‧‧‧ panel
510‧‧‧曲面邊緣510‧‧‧ curved edge
520‧‧‧導角邊緣520‧‧‧ Leading edge
第1圖是繪示本新型一第一實施例之面板之曲面研磨砂輪的剖視圖。1 is a cross-sectional view showing a curved grinding wheel of a panel according to a first embodiment of the present invention.
第2圖是繪示第1圖所示之曲面研磨砂輪其中A部的放大圖。Fig. 2 is an enlarged view showing a portion A of the curved grinding wheel shown in Fig. 1.
第3圖是繪示本新型一第二實施例之面板之曲面研磨砂輪的剖視圖。Figure 3 is a cross-sectional view showing a curved grinding wheel of the panel of the second embodiment of the present invention.
第4圖是繪示本新型一第三實施例之面板之曲面研磨砂輪的剖視圖。Fig. 4 is a cross-sectional view showing a curved grinding wheel of a panel according to a third embodiment of the present invention.
第5圖是繪示第4圖所示之曲面研磨砂輪其中B部的放大圖。Fig. 5 is an enlarged view showing a portion B of the curved grinding wheel shown in Fig. 4.
第6圖是繪示本新型一第四實施例之面板之曲面研磨砂輪的剖視立體圖。Figure 6 is a cross-sectional perspective view showing a curved grinding wheel of the panel of the fourth embodiment of the present invention.
第7圖是繪示依照本新型之曲面研磨砂輪所研磨之一面板的剖視圖。Figure 7 is a cross-sectional view showing one of the panels polished by the curved abrasive wheel according to the present invention.
有關本新型之前述及其他技術內容、特點與功效，在以下配合參考圖式之實施例詳細說明當中，將可清楚的呈現。The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of embodiments with reference to the drawings.
請參閱第1圖及第2圖，依照本新型一第一實施例之面板之曲面研磨砂輪包括有一第一研磨砂輪單元100與一第二研磨砂輪單元200。Referring to FIG. 1 and FIG. 2, the curved grinding wheel of the panel according to the first embodiment of the present invention includes a first grinding wheel unit 100 and a second grinding wheel unit 200.
第一研磨砂輪單元100具有一第一基座環110與設於該第一基座環之外周的一第一研磨件120，該第一研磨件具有一第一曲面研磨部121。第二研磨砂輪單元200疊置結合於第一研磨砂輪單元100，且第二研磨砂輪單元亦具有一第二基座環210與設於該第二基座環之外周的一第二研磨件220，該第二研磨件亦具有一第二曲面研磨部221。第一研磨砂輪單元100與第二研磨砂輪單元200以結合件300相互疊置結合。在第一實施例當中，結合件300 為一膠劑結合件310，其結合於第一研磨砂輪單元100與第二研磨砂輪單元200的相鄰面之間。The first grinding wheel unit 100 has a first base ring 110 and a first grinding member 120 disposed on the outer circumference of the first base ring. The first grinding member has a first curved surface grinding portion 121. The second grinding wheel unit 200 is stacked and coupled to the first grinding wheel unit 100, and the second grinding wheel unit also has a second base ring 210 and a second grinding member 220 disposed on the outer circumference of the second base ring. The second abrasive member also has a second curved surface grinding portion 221. The first grinding wheel unit 100 and the second grinding wheel unit 200 are superposed on each other with the coupling member 300. In the first embodiment, the joint 300 A glue bond 310 is bonded between the adjacent surfaces of the first abrasive wheel unit 100 and the second abrasive wheel unit 200.
第一研磨件120及第二研磨件220可為以金屬粉末及鑽石粒燒結而成的研磨件，或以鑽石粒電鍍而成的研磨件。在第一實施例當中，第一研磨件120係以金屬粉末及鑽石粒燒結而成的研磨件，而第二研磨件220則為鑽石粒電鍍而成的研磨件。The first polishing member 120 and the second polishing member 220 may be an abrasive member sintered with metal powder and diamond particles, or an abrasive member plated with diamond particles. In the first embodiment, the first polishing member 120 is an abrasive member obtained by sintering metal powder and diamond particles, and the second polishing member 220 is an abrasive member plated with diamond particles.
第二研磨件220的表面較第一研磨件120的表面為細。且第一基座環110為材質較應的鐵製基座環，而第二基座環210則為材質較軟的鋁製基座環。依第一研磨砂輪單元100之第一曲面研磨部121可以對面板的表面邊緣進行粗磨的研磨作業，繼之，依第二研磨砂輪單元200之第二曲面研磨部221可以對面板的表面邊緣進行細磨的研磨作業，使得面板500的表面具有光滑的曲面邊緣510(請參閱第7圖)。而且第二研磨砂輪單元200其中的第二基座環210係採用較為軟質的鋁製基環座，可以緩衝第二研磨件220與面板500邊緣的接觸力道，避免面板500的邊緣產生破裂或碎邊。The surface of the second abrasive member 220 is thinner than the surface of the first abrasive member 120. The first susceptor ring 110 is a steel susceptor ring corresponding to the material, and the second susceptor ring 210 is a soft aluminum susceptor ring. According to the first curved surface grinding portion 121 of the first grinding wheel unit 100, a rough grinding operation of the surface edge of the panel may be performed, and then, the second curved surface grinding portion 221 of the second grinding wheel unit 200 may face the surface edge of the panel. A fine grinding operation is performed such that the surface of the panel 500 has a smooth curved edge 510 (see Figure 7). Moreover, the second pedestal ring 210 of the second grinding wheel unit 200 adopts a relatively soft aluminum base ring seat, which can buffer the contact force between the second grinding member 220 and the edge of the panel 500, thereby preventing the edge of the panel 500 from being broken or broken. side.
請參閱第3圖，依照本新型一第二實施例之面板之曲面研磨砂輪仍然包括有一第一研磨砂輪單元100與一第二研磨砂輪單元200，其結構與第一實施例所示者相似。惟其中的結合件300為螺栓結合件320，其貫穿結合於第一研磨砂輪單元100與第二研磨砂輪單元200。Referring to FIG. 3, the curved abrasive grinding wheel of the panel according to the second embodiment of the present invention still includes a first grinding wheel unit 100 and a second grinding wheel unit 200, the structure of which is similar to that shown in the first embodiment. The coupling member 300 is a bolt joint 320 that is coupled to the first grinding wheel unit 100 and the second grinding wheel unit 200.
請參閱第4圖及第5圖，依照本新型一第三實 施例之面板之曲面研磨砂輪仍然包括有一第一研磨砂輪單元100與一第二研磨砂輪單元200，其結構與第一實施例所示者相似。惟其中的第一研磨件120及第二研磨件220皆為以金屬粉末及鑽石粒燒結而成的研磨件。而且，第一研磨件120在位於第一曲面研磨部121的相對側另外具有一第一導角研磨部122，而第二研磨件220在位於第二曲面研磨部221的相對側亦另外具有一第二導角研磨部222。依此，在相繼以第一曲面研磨部121及第二曲面研磨部221對面板500的表面邊緣進行粗磨及細磨的研磨以形成曲面邊緣510時，亦可同時以第一導角研磨部122及第二導角研磨部222相繼對面板500的背面邊緣進行粗磨及細磨的研磨，以在面板500的背面形成一導角邊緣520。Please refer to Figures 4 and 5, in accordance with the third embodiment of the present invention. The curved grinding wheel of the panel of the embodiment still includes a first grinding wheel unit 100 and a second grinding wheel unit 200, the structure of which is similar to that shown in the first embodiment. The first polishing member 120 and the second polishing member 220 are both abrasive members sintered from metal powder and diamond particles. Moreover, the first abrasive member 120 has a first lead angle polishing portion 122 on the opposite side of the first curved surface polishing portion 121, and the second polishing member 220 has another one on the opposite side of the second curved surface polishing portion 221 The second corner polishing portion 222. Accordingly, when the surface edges of the panel 500 are roughly ground and finely ground by the first curved surface polishing portion 121 and the second curved surface polishing portion 221 to form the curved edge 510, the first conductive angle polishing portion may be simultaneously used. 122 and the second corner polishing portion 222 successively perform rough grinding and fine grinding of the back edge of the panel 500 to form a leading edge 520 on the back surface of the panel 500.
請參閱第6圖，依照本新型一第四實施例之面板之曲面研磨砂輪仍然包括有一第一研磨砂輪單元100與一第二研磨砂輪單元200，其結構與第三實施例所示者相似。惟其中的第一研磨件120及第二研磨件220皆為以鑽石粒電鍍而成的研磨件。而且，第二研磨砂輪單元200具有二個第二研磨件220，其各具有一第二曲面研磨部221及一第二導角研磨部222。之所以如此設計，是因為粗表面之第一研磨件120的使用壽命通常為細表面之第二研磨件220的使用壽命的二倍，因此以一第一研磨件120配設二個第二研磨件220。再者，第一研磨砂輪單元100及第二研磨砂輪單元200設有輻射狀間隔排列之上下貫通的多數道排屑溝400，用以排除研磨面板時所產生的粉屑。雖未圖示， 但在上述的第一、二、三實施例當中，其第一研磨砂輪單元100及第二研磨砂輪單元200亦設有多數道排屑溝。Referring to FIG. 6, the curved abrasive grinding wheel of the panel according to the fourth embodiment of the present invention further includes a first grinding wheel unit 100 and a second grinding wheel unit 200, the structure of which is similar to that shown in the third embodiment. The first abrasive member 120 and the second abrasive member 220 are both abrasive members plated with diamond particles. Moreover, the second grinding wheel unit 200 has two second grinding members 220 each having a second curved surface polishing portion 221 and a second curved surface polishing portion 222. The reason for this design is that the service life of the first abrasive member 120 of the rough surface is usually twice the service life of the second abrasive member 220 of the thin surface, so that the second abrasive member 120 is provided with two second abrasives. Pie. 220. Furthermore, the first grinding wheel unit 100 and the second grinding wheel unit 200 are provided with a plurality of rows of chip flutes 400 that are arranged radially above and below the radial spacing to exclude the dust generated when the panel is polished. Although not shown, However, in the first, second and third embodiments described above, the first grinding wheel unit 100 and the second grinding wheel unit 200 are also provided with a plurality of ball flutes.
依據本新型一實施方式面板之曲面研磨砂輪，可以將面板的表面研磨出曲面的邊緣，且可以對面板的邊緣分別進行粗磨及細磨的研磨加工，以獲得良好的研磨品質。According to the curved grinding wheel of the panel of the present invention, the surface of the panel can be grounded to the edge of the curved surface, and the edge of the panel can be roughly ground and finely ground to obtain good grinding quality.
雖然本新型以實施方式揭露如上，然其並非用以限定本新型，任何熟習此技藝者，在不脫離本新型的精神和範圍內，當可作各種的更動與潤飾，因此本新型之保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention is disclosed in the above embodiments, it is not intended to limit the present invention. Any one skilled in the art can make various modifications and retouchings without departing from the spirit and scope of the present invention. It is subject to the definition of the scope of the patent application attached.
100‧‧‧第一研磨砂輪單元100‧‧‧First grinding wheel unit
110‧‧‧第一基座環110‧‧‧First pedestal ring
120‧‧‧第一研磨件120‧‧‧First abrasive parts
121‧‧‧第一曲面研磨部121‧‧‧First curved surface grinding department
200‧‧‧第二研磨砂輪單元200‧‧‧Second grinding wheel unit
210‧‧‧第二基座環210‧‧‧Second susceptor ring
220‧‧‧第二研磨件220‧‧‧Second grinding parts
221‧‧‧第二曲面研磨部221‧‧‧Second curved surface grinding department
300‧‧‧結合件300‧‧‧Connected parts
310‧‧‧膠劑結合件310‧‧‧ glue joints
Claims (9)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103213588U TWM492804U (en) | 2014-07-31 | 2014-07-31 | Surface curved grinding wheel |
| CN201420546636.1U CN204195477U (en) | 2014-07-31 | 2014-09-22 | Grinding wheel for grinding curved surface of panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103213588U TWM492804U (en) | 2014-07-31 | 2014-07-31 | Surface curved grinding wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TWM492804U true TWM492804U (en) | 2015-01-01 |
Family
ID=52653476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW103213588U TWM492804U (en) | 2014-07-31 | 2014-07-31 | Surface curved grinding wheel |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN204195477U (en) |
| TW (1) | TWM492804U (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234849A (en) * | 2015-09-16 | 2016-01-13 | 丹阳市长平机械有限公司 | Combined grinding wheel |
| CN105252390A (en) * | 2015-11-09 | 2016-01-20 | 丹阳市长平机械有限公司 | Small abrasive wheel polishing machine |
| CN110076701B (en) * | 2019-06-19 | 2023-06-02 | 郑州中岳机电设备有限公司 | Metal bond grinding wheel for grinding steel rail |
| JP7288373B2 (en) * | 2019-09-09 | 2023-06-07 | キオクシア株式会社 | Grinding device, grinding wheel, and grinding method |
| WO2021121329A1 (en) * | 2019-12-19 | 2021-06-24 | 宋京新 | Combined electroplated grinding wheel |
-
2014
- 2014-07-31 TW TW103213588U patent/TWM492804U/en not_active IP Right Cessation
- 2014-09-22 CN CN201420546636.1U patent/CN204195477U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN204195477U (en) | 2015-03-11 |
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| MK4K | Expiration of patent term of a granted utility model |