BE738225A - Nouveaux composés organiques hétérocycliques azotés - Google Patents

Nouveaux composés organiques hétérocycliques azotés

Info

Publication number
BE738225A
BE738225A BE738225A BE738225A BE738225A BE 738225 A BE738225 A BE 738225A BE 738225 A BE738225 A BE 738225A BE 738225 A BE738225 A BE 738225A BE 738225 A BE738225 A BE 738225A
Authority
BE
Belgium
Prior art keywords
organic compounds
heterocyclic organic
nitrogenous heterocyclic
new nitrogenous
new
Prior art date
Application number
BE738225A
Other languages
English (en)
Inventor
J D Mee
P W Jenkins
D W Heseltine
Original Assignee
Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of BE738225A publication Critical patent/BE738225A/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/09—Sensitisors or activators, e.g. dyestuffs
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
    • C07D209/04—Indoles; Hydrogenated indoles
    • C07D209/08—Indoles; Hydrogenated indoles with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to carbon atoms of the hetero ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
    • C07D209/04—Indoles; Hydrogenated indoles
    • C07D209/10—Indoles; Hydrogenated indoles with substituted hydrocarbon radicals attached to carbon atoms of the hetero ring
    • C07D209/12—Radicals substituted by oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/02—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups
    • C09B23/04—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups one >CH- group, e.g. cyanines, isocyanines, pseudocyanines
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/02—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups
    • C09B23/06—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups three >CH- groups, e.g. carbocyanines
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/02—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups
    • C09B23/08—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups more than three >CH- groups, e.g. polycarbocyanines
    • C09B23/083—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups more than three >CH- groups, e.g. polycarbocyanines five >CH- groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/02—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups
    • C09B23/08—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups more than three >CH- groups, e.g. polycarbocyanines
    • C09B23/086—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups more than three >CH- groups, e.g. polycarbocyanines more than five >CH- groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/10—The polymethine chain containing an even number of >CH- groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/10—The polymethine chain containing an even number of >CH- groups
    • C09B23/105—The polymethine chain containing an even number of >CH- groups two >CH- groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/10—The polymethine chain containing an even number of >CH- groups
    • C09B23/107—The polymethine chain containing an even number of >CH- groups four >CH- groups
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/10—Organic substances
    • G03C1/12—Methine and polymethine dyes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/485—Direct positive emulsions
    • G03C1/48515—Direct positive emulsions prefogged
    • G03C1/48523—Direct positive emulsions prefogged characterised by the desensitiser
    • G03C1/4853—Direct positive emulsions prefogged characterised by the desensitiser polymethine dyes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/72—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
    • G03F7/031—Organic compounds not covered by group G03F7/029
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • G03G5/0664—Dyes
    • G03G5/0666—Dyes containing a methine or polymethine group
    • G03G5/0668—Dyes containing a methine or polymethine group containing only one methine or polymethine group
    • G03G5/067—Dyes containing a methine or polymethine group containing only one methine or polymethine group containing hetero rings

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Indole Compounds (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
BE738225A 1968-10-09 1969-08-29 Nouveaux composés organiques hétérocycliques azotés BE738225A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76630768A 1968-10-09 1968-10-09

Publications (1)

Publication Number Publication Date
BE738225A true BE738225A (fr) 1970-03-02

Family

ID=25076052

Family Applications (10)

Application Number Title Priority Date Filing Date
BE738227A BE738227A (fr) 1968-10-09 1969-08-29 Emulsion photographique sensibilisée spectralement
BE738225A BE738225A (fr) 1968-10-09 1969-08-29 Nouveaux composés organiques hétérocycliques azotés
BE738226A BE738226A (fr) 1968-10-09 1969-08-29
BE738229A BE738229A (fr) 1968-10-09 1969-08-29
BE738228A BE738228A (fr) 1968-10-09 1969-08-29
BE738230A BE738230A (fr) 1968-10-09 1969-08-29
BE740043A BE740043A (fr) 1968-10-09 1969-10-09
BE740042A BE740042A (fr) 1968-10-09 1969-10-09
BE740041A BE740041A (fr) 1968-10-09 1969-10-09 Emulsion photographique sensibilisée spectralement
BE740044A BE740044A (fr) 1968-10-09 1969-10-09

Family Applications Before (1)

Application Number Title Priority Date Filing Date
BE738227A BE738227A (fr) 1968-10-09 1969-08-29 Emulsion photographique sensibilisée spectralement

Family Applications After (8)

Application Number Title Priority Date Filing Date
BE738226A BE738226A (fr) 1968-10-09 1969-08-29
BE738229A BE738229A (fr) 1968-10-09 1969-08-29
BE738228A BE738228A (fr) 1968-10-09 1969-08-29
BE738230A BE738230A (fr) 1968-10-09 1969-08-29
BE740043A BE740043A (fr) 1968-10-09 1969-10-09
BE740042A BE740042A (fr) 1968-10-09 1969-10-09
BE740041A BE740041A (fr) 1968-10-09 1969-10-09 Emulsion photographique sensibilisée spectralement
BE740044A BE740044A (fr) 1968-10-09 1969-10-09

Country Status (8)

Country Link
US (1) US3615432A (fr)
JP (4) JPS4931127B1 (fr)
BE (10) BE738227A (fr)
BR (6) BR6913050D0 (fr)
CH (3) CH530027A (fr)
DE (5) DE1950726C3 (fr)
FR (6) FR2020246A1 (fr)
GB (4) GB1276129A (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770451A (en) * 1968-10-09 1973-11-06 Eastman Kodak Co Silver halide emulsions sensitized with dyes containing heterocyclic nitrogen atoms substituted with an -or group
JPS5138994U (fr) * 1974-09-14 1976-03-23
JPS525012A (en) * 1975-06-28 1977-01-14 Kubota Ltd Pipe joint
JPS5253093U (fr) * 1975-10-13 1977-04-15
US4197080A (en) * 1979-02-14 1980-04-08 Eastman Kodak Company Radiation-cleavable nondiffusible compounds and photographic elements and processes employing them
US4410618A (en) * 1982-06-11 1983-10-18 Eastman Kodak Company Blocked photographic reagents
JPH083621B2 (ja) 1985-07-31 1996-01-17 富士写真フイルム株式会社 画像形成方法
JPH0184698U (fr) * 1987-11-27 1989-06-06
DE3833987A1 (de) * 1988-10-06 1990-04-12 Hans A Urban Verfahren zum herstellen einer dauerwellenfluessigkeit sowie zum wellen von haaren unter verwendung dieser dauerwellenfluessigkeit
DE8812988U1 (de) * 1988-10-15 1988-12-22 Ahsmann, Dieter, 4520 Melle Schrank
CA2023112C (fr) * 1989-08-11 2000-09-26 Jun Yamaguchi Materiau d'enregistrement sensible a la lumiere et a la chaleur
JP2520763B2 (ja) * 1990-04-20 1996-07-31 富士写真フイルム株式会社 水溶性メチン化合物および該化合物を含むハロゲン化銀写真乳剤
GB9508031D0 (en) * 1995-04-20 1995-06-07 Minnesota Mining & Mfg UV-absorbing media bleachable by IR-radiation
US6376163B1 (en) 2000-02-22 2002-04-23 Eastman Kodak Company Photobleachable composition, photographic element containing the composition and photobleachable method
US6207359B1 (en) 2000-02-22 2001-03-27 Eastman Kodak Company Method for reducing the dye stain in photographic elements
US6974662B2 (en) * 2003-08-04 2005-12-13 Eastman Kodak Company Thermal base precursors
US8367304B2 (en) 2008-06-08 2013-02-05 Apple Inc. Techniques for marking product housings
US9173336B2 (en) 2009-05-19 2015-10-27 Apple Inc. Techniques for marking product housings
US8663806B2 (en) 2009-08-25 2014-03-04 Apple Inc. Techniques for marking a substrate using a physical vapor deposition material
US9845546B2 (en) * 2009-10-16 2017-12-19 Apple Inc. Sub-surface marking of product housings
US8809733B2 (en) 2009-10-16 2014-08-19 Apple Inc. Sub-surface marking of product housings
US10071583B2 (en) 2009-10-16 2018-09-11 Apple Inc. Marking of product housings
US20120248001A1 (en) 2011-03-29 2012-10-04 Nashner Michael S Marking of Fabric Carrying Case for Portable Electronic Device
US9280183B2 (en) 2011-04-01 2016-03-08 Apple Inc. Advanced techniques for bonding metal to plastic
US20130075126A1 (en) * 2011-09-27 2013-03-28 Michael S. Nashner Laser Bleached Marking of Dyed Anodization
US10071584B2 (en) 2012-07-09 2018-09-11 Apple Inc. Process for creating sub-surface marking on plastic parts
DE202012104055U1 (de) 2012-10-22 2012-11-13 Fluoron Gmbh Spritze zur Injektion eines chirurgischen Gases
US9434197B2 (en) 2013-06-18 2016-09-06 Apple Inc. Laser engraved reflective surface structures
US9314871B2 (en) 2013-06-18 2016-04-19 Apple Inc. Method for laser engraved reflective surface structures

Also Published As

Publication number Publication date
GB1281566A (en) 1972-07-12
BR6913046D0 (pt) 1973-01-25
FR2020244A1 (fr) 1970-07-10
BE738230A (fr) 1970-03-02
DE1950766A1 (de) 1970-04-16
BE738228A (fr) 1970-03-02
CH530027A (fr) 1972-10-31
GB1281567A (en) 1972-07-12
BR6913051D0 (pt) 1973-05-10
DE1950757A1 (de) 1970-05-14
FR2020246A1 (fr) 1970-07-10
GB1281565A (en) 1972-07-12
BE738229A (fr) 1970-03-02
CH506096A (fr) 1971-04-15
DE1950746A1 (de) 1970-04-09
US3615432A (en) 1971-10-26
FR2022244A1 (fr) 1970-07-31
BE740041A (fr) 1970-03-16
JPS4930131B1 (fr) 1974-08-10
CH517317A (fr) 1971-12-31
DE1950726A1 (de) 1970-05-14
BE738226A (fr) 1970-03-02
FR2020243A1 (fr) 1970-07-10
BE738227A (fr) 1970-03-02
FR2020247A1 (fr) 1970-07-10
DE1950735A1 (de) 1970-04-23
JPS4931127B1 (fr) 1974-08-19
DE1950766B2 (de) 1971-03-18
BE740043A (fr) 1970-03-16
FR2020245A1 (fr) 1970-07-10
BE740042A (fr) 1970-03-16
JPS505584B1 (fr) 1975-03-05
DE1950726C3 (de) 1982-02-04
JPS4910691B1 (fr) 1974-03-12
BE740044A (fr) 1970-03-16
BR6913048D0 (pt) 1973-01-25
BR6913047D0 (pt) 1973-01-25
BR6913050D0 (pt) 1973-06-07
BR6913049D0 (pt) 1973-01-25
DE1950726B2 (de) 1981-05-07
DE1950779A1 (de) 1970-05-14
GB1276129A (en) 1972-06-01

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