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Publication of FR549238ApublicationCriticalpatent/FR549238A/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
FR549238D1921-03-241922-03-22Dispositif pour enregistrer des sons, sans déformation
ExpiredFR549238A
(fr)