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Publication of FR41809EpublicationCriticalpatent/FR41809E/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
FR41809D1931-12-191931-12-19Dispositif pour la projection des films sonores
ExpiredFR41809E
(fr)