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Pathe Cinema SA
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Pathe Cinema SA
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Publication of FR689916ApublicationCriticalpatent/FR689916A/en
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR689916D1929-04-231929-04-23
Sound recording process, intended primarily for synchronizing sounds with cinematographic projections
ExpiredFR689916A
(en)