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App Et Films Sonores SA Franc
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App Et Films Sonores SA Franc
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Publication of FR725855ApublicationCriticalpatent/FR725855A/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
FR725855D1930-11-241931-11-06
Improvements to devices for recording sounds on sound films
ExpiredFR725855A
(en)