GB752243A - Ceramic body and method of making it - Google Patents
Ceramic body and method of making itInfo
- Publication number
- GB752243A GB752243A GB5753/54A GB575354A GB752243A GB 752243 A GB752243 A GB 752243A GB 5753/54 A GB5753/54 A GB 5753/54A GB 575354 A GB575354 A GB 575354A GB 752243 A GB752243 A GB 752243A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- radiations
- computed
- group
- article
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 title abstract 2
- 238000004519 manufacturing process Methods 0.000 title 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 abstract 3
- 238000010438 heat treatment Methods 0.000 abstract 3
- 230000005855 radiation Effects 0.000 abstract 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 abstract 2
- 239000000470 constituent Substances 0.000 abstract 2
- 239000010931 gold Substances 0.000 abstract 2
- 229910001947 lithium oxide Inorganic materials 0.000 abstract 2
- 239000010453 quartz Substances 0.000 abstract 2
- 229910052644 β-spodumene Inorganic materials 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- 229910021607 Silver chloride Inorganic materials 0.000 abstract 1
- 238000000137 annealing Methods 0.000 abstract 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 abstract 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 abstract 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 abstract 1
- WVMPCBWWBLZKPD-UHFFFAOYSA-N dilithium oxido-[oxido(oxo)silyl]oxy-oxosilane Chemical compound [Li+].[Li+].[O-][Si](=O)O[Si]([O-])=O WVMPCBWWBLZKPD-UHFFFAOYSA-N 0.000 abstract 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052737 gold Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 235000011118 potassium hydroxide Nutrition 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 abstract 1
- 239000006104 solid solution Substances 0.000 abstract 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 abstract 1
- 229910001887 tin oxide Inorganic materials 0.000 abstract 1
- 229910000500 β-quartz Inorganic materials 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
- C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/006—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/02—Compositions for glass with special properties for coloured glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/04—Compositions for glass with special properties for photosensitive glass
- C03C4/06—Compositions for glass with special properties for photosensitive glass for phototropic or photochromic glass
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Glass Compositions (AREA)
- Compositions Of Oxide Ceramics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US322183XA | 1953-03-05 | 1953-03-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB752243A true GB752243A (en) | 1956-07-11 |
Family
ID=21863735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5753/54A Expired GB752243A (en) | 1953-03-05 | 1954-02-26 | Ceramic body and method of making it |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE526937A (xx) |
CH (1) | CH322183A (xx) |
DE (1) | DE962110C (xx) |
FR (1) | FR1096398A (xx) |
GB (1) | GB752243A (xx) |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3366467A (en) * | 1963-02-06 | 1968-01-30 | Agency Ind Science Techn | Radiation process of deforming glass fiber materials |
US4189325A (en) | 1979-01-09 | 1980-02-19 | The Board of Regents, State of Florida, University of Florida | Glass-ceramic dental restorations |
EP0175820A1 (en) * | 1982-08-16 | 1986-04-02 | Boris L. Rudoi | Making high strength semi-crystalline ceramic material |
US5096882A (en) * | 1987-04-08 | 1992-03-17 | Hitachi, Ltd. | Process for controlling oxygen content of superconductive oxide, superconductive device and process for production thereof |
US5102833A (en) * | 1991-07-10 | 1992-04-07 | Alfred University | Strengthening glass articles with electromagnetic radiation and resulting product |
FR2850646A1 (fr) * | 2003-02-03 | 2004-08-06 | Schott Glas | Corps photostructurable, procede pour le traitement d'un verre et/ou d'une vitroceramique, production de divers produits qui en sont derives, leur utilisation et objet utilisant ledit corps |
US7816291B2 (en) | 2003-08-07 | 2010-10-19 | Ivoclar Vivadent Ag | Lithium silicate materials |
US7993137B2 (en) | 2005-02-08 | 2011-08-09 | Ivoclar Vivadent Ag | Lithium silicate materials |
US8444756B2 (en) | 2003-08-07 | 2013-05-21 | Ivoclar Vivadent Ag | Lithium silicate materials |
WO2013053864A3 (de) * | 2011-10-14 | 2013-07-11 | Ivoclar Vivadent Ag | Lithiumsilikat-glaskeramik und -glas mit zweiwertigem metalloxid |
WO2013053866A3 (de) * | 2011-10-14 | 2013-08-08 | Ivoclar Vivadent Ag | Lithiumsilikat-glaskeramik und -glas mit vierwertigem metalloxid |
US8557150B2 (en) | 2010-04-16 | 2013-10-15 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with ZrO2 content |
US9220576B2 (en) | 2003-08-07 | 2015-12-29 | Ivoclar Vivadent Ag | Machining of ceramic materials |
US9326835B2 (en) | 2010-04-16 | 2016-05-03 | Ivoclar Vivadent Ag | Process for the preparation of dental restorations |
US9371249B2 (en) | 2012-05-04 | 2016-06-21 | Ivoclar Vivadent Ag | Lithium disilicate-apatite glass-ceramic |
US9402699B2 (en) | 2011-10-14 | 2016-08-02 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a trivalent metal oxide |
US9403714B2 (en) | 2011-10-14 | 2016-08-02 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a hexavalent metal oxide |
US9757217B2 (en) | 2012-05-11 | 2017-09-12 | Ivoclar Vivadent Ag | Pre-sintered blank for dental purposes |
US9757311B2 (en) | 2013-04-15 | 2017-09-12 | Ivoclar Vivadent Ag | Lithium silicate glass ceramics and lithium silicate glass containing cesium oxide |
US9878939B2 (en) | 2011-10-14 | 2018-01-30 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with monovalent metal oxide |
US10064708B2 (en) | 2013-02-12 | 2018-09-04 | Ivoclar Vivadent Ag | Blank for dental purposes |
US10131569B2 (en) | 2014-05-13 | 2018-11-20 | Ivoclar Vivadent Ag | Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics |
US10227255B2 (en) | 2011-10-14 | 2019-03-12 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a pentavalent metal oxide |
US10376343B2 (en) | 2013-04-15 | 2019-08-13 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with rubidium oxide content |
US10457589B2 (en) | 2015-01-30 | 2019-10-29 | Ivoclar Vivadent Ag | Lithium silicate diopside glass ceramics |
US10470854B2 (en) | 2012-05-11 | 2019-11-12 | Ivoclar Vivadent Ag | Pre-sintered blank for dental purposes |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE562405A (xx) * | 1956-11-15 | |||
BE586155A (xx) * | 1958-12-31 | |||
NL110239C (xx) * | 1958-12-31 | |||
DE1255876B (de) * | 1959-03-27 | 1967-12-07 | Westinghouse Electric Corp | Verfahren zum Herstellen von Glas-Kristall-Mischkoerpern |
-
0
- BE BE526937D patent/BE526937A/xx unknown
-
1954
- 1954-02-26 GB GB5753/54A patent/GB752243A/en not_active Expired
- 1954-03-01 CH CH322183D patent/CH322183A/fr unknown
- 1954-03-02 FR FR1096398D patent/FR1096398A/fr not_active Expired
- 1954-03-02 DE DEC8967A patent/DE962110C/de not_active Expired
Cited By (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3366467A (en) * | 1963-02-06 | 1968-01-30 | Agency Ind Science Techn | Radiation process of deforming glass fiber materials |
US4189325A (en) | 1979-01-09 | 1980-02-19 | The Board of Regents, State of Florida, University of Florida | Glass-ceramic dental restorations |
EP0175820A1 (en) * | 1982-08-16 | 1986-04-02 | Boris L. Rudoi | Making high strength semi-crystalline ceramic material |
US5096882A (en) * | 1987-04-08 | 1992-03-17 | Hitachi, Ltd. | Process for controlling oxygen content of superconductive oxide, superconductive device and process for production thereof |
US5102833A (en) * | 1991-07-10 | 1992-04-07 | Alfred University | Strengthening glass articles with electromagnetic radiation and resulting product |
FR2850646A1 (fr) * | 2003-02-03 | 2004-08-06 | Schott Glas | Corps photostructurable, procede pour le traitement d'un verre et/ou d'une vitroceramique, production de divers produits qui en sont derives, leur utilisation et objet utilisant ledit corps |
US8042358B2 (en) | 2003-08-07 | 2011-10-25 | Ivoclar Vivadent Ag | Lithium silicate materials |
US10136973B2 (en) | 2003-08-07 | 2018-11-27 | Ivoclar Vivadent Ag | Lithium silicate materials |
US9220576B2 (en) | 2003-08-07 | 2015-12-29 | Ivoclar Vivadent Ag | Machining of ceramic materials |
US8047021B2 (en) | 2003-08-07 | 2011-11-01 | Ivoclar Vivadent Ag | Lithium silicate materials |
US7816291B2 (en) | 2003-08-07 | 2010-10-19 | Ivoclar Vivadent Ag | Lithium silicate materials |
US8444756B2 (en) | 2003-08-07 | 2013-05-21 | Ivoclar Vivadent Ag | Lithium silicate materials |
US11109949B2 (en) | 2003-08-07 | 2021-09-07 | Ivoclar Vivadent Ag | Lithium silicate materials |
US11744685B2 (en) | 2003-08-07 | 2023-09-05 | Ivoclar Vivadent Ag | Lithium silicate materials |
US9918806B2 (en) | 2003-08-07 | 2018-03-20 | Ivoclar Vivadent Ag | Machining of ceramic materials |
US9248078B2 (en) | 2003-08-07 | 2016-02-02 | Ivoclar Vivadent Ag | Lithium silicate materials |
US11369460B2 (en) | 2003-08-07 | 2022-06-28 | Ivoclar Vivadent Ag | Lithium silicate materials |
US8546280B2 (en) | 2005-02-08 | 2013-10-01 | Ivoclar Vivadent Ag | Lithium silicate materials |
US8940651B2 (en) | 2005-02-08 | 2015-01-27 | Ivoclar Vivadent Ag | Lithium silicate materials |
US12006247B2 (en) | 2005-02-08 | 2024-06-11 | Ivoclar Vivadent Ag | Lithium silicate materials |
US10981823B2 (en) | 2005-02-08 | 2021-04-20 | Ivoclar Vivadent Ag | Lithium silicate materials |
US8162664B2 (en) | 2005-02-08 | 2012-04-24 | Ivoclar Vivadent Ag | Lithium silicate materials |
US9434639B2 (en) | 2005-02-08 | 2016-09-06 | Ivoclar Vivadent Ag | Lithium silicate materials |
US10214443B2 (en) | 2005-02-08 | 2019-02-26 | Ivoclar Vivadent Ag | Lithium silicate materials |
US7993137B2 (en) | 2005-02-08 | 2011-08-09 | Ivoclar Vivadent Ag | Lithium silicate materials |
US9249048B2 (en) | 2010-04-16 | 2016-02-02 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with ZrO2 content |
US8557150B2 (en) | 2010-04-16 | 2013-10-15 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with ZrO2 content |
US9321674B2 (en) | 2010-04-16 | 2016-04-26 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with transition metal oxide |
US9326835B2 (en) | 2010-04-16 | 2016-05-03 | Ivoclar Vivadent Ag | Process for the preparation of dental restorations |
US9956146B2 (en) | 2010-04-16 | 2018-05-01 | Ivoclar Vivadent Ag | Process for the preparation of dental restorations |
US9403714B2 (en) | 2011-10-14 | 2016-08-02 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a hexavalent metal oxide |
US10227255B2 (en) | 2011-10-14 | 2019-03-12 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a pentavalent metal oxide |
RU2633485C2 (ru) * | 2011-10-14 | 2017-10-12 | Ивоклар Вивадент Аг | Литиево-силикатные стеклокерамика и стекло с оксидом четырехвалентного металла |
US9878939B2 (en) | 2011-10-14 | 2018-01-30 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with monovalent metal oxide |
WO2013053864A3 (de) * | 2011-10-14 | 2013-07-11 | Ivoclar Vivadent Ag | Lithiumsilikat-glaskeramik und -glas mit zweiwertigem metalloxid |
WO2013053866A3 (de) * | 2011-10-14 | 2013-08-08 | Ivoclar Vivadent Ag | Lithiumsilikat-glaskeramik und -glas mit vierwertigem metalloxid |
US9232989B2 (en) | 2011-10-14 | 2016-01-12 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a divalent metal oxide |
US10098716B2 (en) | 2011-10-14 | 2018-10-16 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with hexavalent metal oxide |
US9402699B2 (en) | 2011-10-14 | 2016-08-02 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a trivalent metal oxide |
US10358380B2 (en) | 2011-10-14 | 2019-07-23 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with divalent metal oxide |
US10160687B2 (en) | 2011-10-14 | 2018-12-25 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with tetravalent metal oxide |
US10321980B2 (en) | 2011-10-14 | 2019-06-18 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with trivalent metal oxide |
US9695082B2 (en) | 2011-10-14 | 2017-07-04 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and lithium silicate glass comprising a tetravalent metal oxide |
US9776912B2 (en) | 2011-10-14 | 2017-10-03 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with divalent metal oxide |
US9371249B2 (en) | 2012-05-04 | 2016-06-21 | Ivoclar Vivadent Ag | Lithium disilicate-apatite glass-ceramic |
US9764982B2 (en) | 2012-05-04 | 2017-09-19 | Ivoclar Vivadent Ag | Lithium disilicate apatite glass-ceramic |
US10206761B2 (en) | 2012-05-11 | 2019-02-19 | Ivoclar Vivadent Ag | Pre-sintered blank for dental purposes |
US9757217B2 (en) | 2012-05-11 | 2017-09-12 | Ivoclar Vivadent Ag | Pre-sintered blank for dental purposes |
US10470854B2 (en) | 2012-05-11 | 2019-11-12 | Ivoclar Vivadent Ag | Pre-sintered blank for dental purposes |
US10064708B2 (en) | 2013-02-12 | 2018-09-04 | Ivoclar Vivadent Ag | Blank for dental purposes |
US10376343B2 (en) | 2013-04-15 | 2019-08-13 | Ivoclar Vivadent Ag | Lithium silicate glass ceramic and glass with rubidium oxide content |
US9757311B2 (en) | 2013-04-15 | 2017-09-12 | Ivoclar Vivadent Ag | Lithium silicate glass ceramics and lithium silicate glass containing cesium oxide |
US10737972B2 (en) | 2014-05-13 | 2020-08-11 | Ivoclar Vivadent Ag | Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics |
US10131569B2 (en) | 2014-05-13 | 2018-11-20 | Ivoclar Vivadent Ag | Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics |
US10457589B2 (en) | 2015-01-30 | 2019-10-29 | Ivoclar Vivadent Ag | Lithium silicate diopside glass ceramics |
Also Published As
Publication number | Publication date |
---|---|
FR1096398A (fr) | 1955-06-20 |
BE526937A (xx) | 1954-09-03 |
CH322183A (fr) | 1957-06-15 |
DE962110C (de) | 1957-04-18 |
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