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Individual
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Publication of FR469836ApublicationCriticalpatent/FR469836A/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
G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
G03B13/18—Focusing aids
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR469836D1914-03-161914-03-16Dispositif de mise au foyer des vues à prendre par la photographie
ExpiredFR469836A
(fr)