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Electrical Research Products Inc
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Electrical Research Products Inc
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Application filed by Electrical Research Products IncfiledCriticalElectrical Research Products Inc
Application grantedgrantedCritical
Publication of FR731447ApublicationCriticalpatent/FR731447A/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
FR731447D1931-02-271932-02-16Perfectionnements concernant les valves de lumière
ExpiredFR731447A
(fr)