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Gerardot & Cie Ets
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Gerardot & Cie Ets
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Application filed by Gerardot & Cie EtsfiledCriticalGerardot & Cie Ets
Application grantedgrantedCritical
Publication of FR686837ApublicationCriticalpatent/FR686837A/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
G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR686837D1929-03-021929-03-02Procédé et dispositif perfectionnés pour l'enregistrement et la reproduction de films parlants
ExpiredFR686837A
(fr)