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.)
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Leperche & Cie Soc
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Leperche & Cie Soc
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Publication date
Application filed by Leperche & Cie SocfiledCriticalLeperche & Cie Soc
Application grantedgrantedCritical
Publication of FR11654EpublicationCriticalpatent/FR11654E/en
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
(AREA)
General Physics & Mathematics
(AREA)
FR11654D1904-03-261909-10-27
Cylindrical apparatus for reproducing drawings by means of electric light
ExpiredFR11654E
(en)