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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
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Publication of FR801550ApublicationCriticalpatent/FR801550A/en
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
FR801550D1935-02-071936-02-05
Improvements to light valves used for recording sounds
ExpiredFR801550A
(en)