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Publication of FR681784ApublicationCriticalpatent/FR681784A/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
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FR681784D1929-09-141929-09-14Procédé et dispositif pour fixer ou enregistrer des émissions ou phénomènes rythmés
ExpiredFR681784A
(fr)