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SORAPEL SOC
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SORAPEL SOC
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Application filed by SORAPEL SOCfiledCriticalSORAPEL SOC
Application grantedgrantedCritical
Publication of FR997402ApublicationCriticalpatent/FR997402A/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
FR997402D1949-09-081949-09-08Perfectionnement aux machines parlantes périodiques continues
ExpiredFR997402A
(fr)