SU572224A3 - Магнитооптическое индикаторное устройство - Google Patents
Магнитооптическое индикаторное устройствоInfo
- Publication number
- SU572224A3 SU572224A3 SU7502142157A SU2142157A SU572224A3 SU 572224 A3 SU572224 A3 SU 572224A3 SU 7502142157 A SU7502142157 A SU 7502142157A SU 2142157 A SU2142157 A SU 2142157A SU 572224 A3 SU572224 A3 SU 572224A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- microcapsules
- color
- film
- magnetic
- substrate
- Prior art date
Links
- 239000002775 capsule Substances 0.000 claims description 54
- 239000000758 substrate Substances 0.000 claims description 32
- 239000006249 magnetic particle Substances 0.000 claims description 28
- 230000005291 magnetic effect Effects 0.000 claims description 18
- 239000003094 microcapsule Substances 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 13
- 239000000696 magnetic material Substances 0.000 claims description 7
- 239000003086 colorant Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 238000004040 coloring Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 description 34
- 238000000576 coating method Methods 0.000 description 34
- 239000000203 mixture Substances 0.000 description 25
- 230000005540 biological transmission Effects 0.000 description 20
- 239000010410 layer Substances 0.000 description 20
- 235000019646 color tone Nutrition 0.000 description 16
- 239000000463 material Substances 0.000 description 14
- 239000000975 dye Substances 0.000 description 12
- 230000004907 flux Effects 0.000 description 11
- 239000003921 oil Substances 0.000 description 8
- 235000019198 oils Nutrition 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 108010010803 Gelatin Proteins 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 229920000159 gelatin Polymers 0.000 description 4
- 239000008273 gelatin Substances 0.000 description 4
- 235000019322 gelatine Nutrition 0.000 description 4
- 235000011852 gelatine desserts Nutrition 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000012780 transparent material Substances 0.000 description 4
- 244000215068 Acacia senegal Species 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229920000084 Gum arabic Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000205 acacia gum Substances 0.000 description 3
- 235000010489 acacia gum Nutrition 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- -1 for example Substances 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007963 capsule composition Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001249 ethyl cellulose Polymers 0.000 description 2
- 235000019325 ethyl cellulose Nutrition 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- 239000004533 oil dispersion Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 239000010930 yellow gold Substances 0.000 description 2
- 229910001097 yellow gold Inorganic materials 0.000 description 2
- 241000219307 Atriplex rosea Species 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 235000019483 Peanut oil Nutrition 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- SJJISKLXUJVZOA-UHFFFAOYSA-N Solvent yellow 56 Chemical compound C1=CC(N(CC)CC)=CC=C1N=NC1=CC=CC=C1 SJJISKLXUJVZOA-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000006267 biphenyl group Chemical group 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005354 coacervation Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000004456 color vision Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003630 growth substance Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000006193 liquid solution Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- XJRBAMWJDBPFIM-UHFFFAOYSA-N methyl vinyl ether Chemical compound COC=C XJRBAMWJDBPFIM-UHFFFAOYSA-N 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002907 paramagnetic material Substances 0.000 description 1
- 239000000312 peanut oil Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- WSWCOQWTEOXDQX-MQQKCMAXSA-N sorbic acid group Chemical group C(\C=C\C=C\C)(=O)O WSWCOQWTEOXDQX-MQQKCMAXSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/091—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect based on magneto-absorption or magneto-reflection
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/17—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169
- G02F1/172—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169 based on a suspension of orientable dipolar particles, e.g. suspended particles displays
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Toys (AREA)
- Photoreceptors In Electrophotography (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47801674A | 1974-06-10 | 1974-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU572224A3 true SU572224A3 (ru) | 1977-09-05 |
Family
ID=23898208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU7502142157A SU572224A3 (ru) | 1974-06-10 | 1975-06-09 | Магнитооптическое индикаторное устройство |
Country Status (7)
| Country | Link |
|---|---|
| JP (2) | JPS6027003B2 (enrdf_load_html_response) |
| CA (1) | CA1023457A (enrdf_load_html_response) |
| CH (1) | CH586913A5 (enrdf_load_html_response) |
| DE (1) | DE2525223C3 (enrdf_load_html_response) |
| FR (1) | FR2280161A1 (enrdf_load_html_response) |
| GB (1) | GB1468768A (enrdf_load_html_response) |
| SU (1) | SU572224A3 (enrdf_load_html_response) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5947676B2 (ja) * | 1977-04-11 | 1984-11-20 | 株式会社パイロット | 磁気パネル |
| JPS60107689A (ja) * | 1983-11-16 | 1985-06-13 | 東京磁気印刷株式会社 | 磁石反転表示磁気パネル |
| JPS63303325A (ja) * | 1987-06-03 | 1988-12-09 | Nippon Sheet Glass Co Ltd | 光学素子電気磁気光学装置 |
| JP2709707B2 (ja) * | 1987-07-14 | 1998-02-04 | 日本製紙 株式会社 | 簡易磁気表示セット |
| JP2582798B2 (ja) * | 1987-08-26 | 1997-02-19 | 日本信号株式会社 | 可視磁気記録シ−トの製造方法 |
| JP2717536B2 (ja) * | 1987-12-02 | 1998-02-18 | 株式会社日本カプセルプロダクツ | 磁気ディスプレーシステム |
| US4937119A (en) * | 1988-12-15 | 1990-06-26 | Hoechst Celanese Corp. | Textured organic optical data storage media and methods of preparation |
| JP2850056B2 (ja) * | 1990-12-28 | 1999-01-27 | 株式会社 日本カプセルプロダクツ | 磁気ディスプレーシステム |
| US5463492A (en) * | 1991-11-01 | 1995-10-31 | Research Frontiers Incorporated | Light modulating film of improved clarity for a light valve |
| US5463491A (en) * | 1991-11-01 | 1995-10-31 | Research Frontiers Incorporated | Light valve employing a film comprising an encapsulated liquid suspension, and method of making such film |
| EP0615629B1 (en) * | 1991-11-01 | 2003-01-02 | Research Frontiers Incorporated | Light valve employing a film comprising an encapsulated liquid suspension, and method of making such film |
| KR960014118B1 (ko) * | 1992-01-10 | 1996-10-14 | 한국유리공업 주식회사 | 광편광현탁액이 고분자수지내에 분산된 투과도 가변창용 필름 및 그 제조방법 |
| US5419706A (en) * | 1993-06-22 | 1995-05-30 | Levy; Richard C. | Apparatus for forming images of non-visible elements underlying an opaque surface |
| EP1051921A1 (en) * | 1999-05-14 | 2000-11-15 | Societe Des Produits Nestle S.A. | Process for the production of cereal granules for porridges |
| JP4748624B2 (ja) * | 2000-01-26 | 2011-08-17 | 株式会社パイロットコーポレーション | 磁性体反転表示パネル |
| US6419498B1 (en) * | 2000-01-26 | 2002-07-16 | Kabushiki Kaisha Pilot | Magnetic material-inverting display panel |
| JP2002365674A (ja) * | 2001-06-12 | 2002-12-18 | Nippon Capsule Products:Kk | 磁気ディスプレー |
| JP3572045B2 (ja) * | 2001-11-27 | 2004-09-29 | 株式会社日本カプセルプロダクツ | 磁気ディスプレー |
| JP5635110B2 (ja) * | 2009-10-21 | 2014-12-03 | サン ケミカル コーポレーション | ピエゾクロミックデバイス |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1536032A (fr) * | 1967-09-06 | 1968-08-09 | Dispositif de réglage de la lumière sensible à l'électricité | |
| US3670323A (en) * | 1970-12-14 | 1972-06-13 | Zenith Radio Corp | Image-display devices comprising particle light modulators with storage |
-
1974
- 1974-11-20 CA CA214,279A patent/CA1023457A/en not_active Expired
- 1974-12-06 JP JP49140384A patent/JPS6027003B2/ja not_active Expired
-
1975
- 1975-05-15 GB GB2063975A patent/GB1468768A/en not_active Expired
- 1975-06-05 CH CH724075A patent/CH586913A5/xx not_active IP Right Cessation
- 1975-06-06 DE DE19752525223 patent/DE2525223C3/de not_active Expired
- 1975-06-09 SU SU7502142157A patent/SU572224A3/ru active
- 1975-06-09 FR FR7517923A patent/FR2280161A1/fr active Granted
-
1982
- 1982-10-01 JP JP57173113A patent/JPS5878186A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| CH586913A5 (enrdf_load_html_response) | 1977-04-15 |
| FR2280161B1 (enrdf_load_html_response) | 1979-02-16 |
| JPS6223294B2 (enrdf_load_html_response) | 1987-05-22 |
| CA1023457A (en) | 1977-12-27 |
| DE2525223B2 (de) | 1979-07-05 |
| GB1468768A (en) | 1977-03-30 |
| JPS50160046A (enrdf_load_html_response) | 1975-12-25 |
| JPS6027003B2 (ja) | 1985-06-26 |
| JPS5878186A (ja) | 1983-05-11 |
| DE2525223C3 (de) | 1980-03-20 |
| FR2280161A1 (fr) | 1976-02-20 |
| DE2525223A1 (de) | 1975-12-18 |
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