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Publication of FR508479ApublicationCriticalpatent/FR508479A/fr
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B27/00—Photographic printing apparatus
G03B27/02—Exposure apparatus for contact printing
G03B27/14—Details
G03B27/18—Maintaining or producing contact pressure between original and light-sensitive material
G03B27/22—Maintaining or producing contact pressure between original and light-sensitive material by stretching over a curved surface
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Physics & Mathematics
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General Physics & Mathematics
(AREA)
FR508479A1914-02-161915-03-23Interrupteur à commande automatique pour appareils de reproductions photographiques industrielles
ExpiredFR508479A
(fr)