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Publication of FR787495ApublicationCriticalpatent/FR787495A/fr
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
FR787495D1934-07-051935-03-18Dispositif pour la production ou pour la reproduction d'inscriptions sonores photographiques
ExpiredFR787495A
(fr)