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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PIERRE JEAN JOSEPH LAFOURCADE
Original Assignee
PIERRE JEAN JOSEPH LAFOURCADE
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Filing date
Publication date
Application filed by PIERRE JEAN JOSEPH LAFOURCADEfiledCriticalPIERRE JEAN JOSEPH LAFOURCADE
Application grantedgrantedCritical
Publication of FR511196ApublicationCriticalpatent/FR511196A/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
(AREA)
General Physics & Mathematics
(AREA)
FR511196A1920-03-081920-03-08Perfectionnements aux appareils à tirer les bleus
ExpiredFR511196A
(fr)