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Electrical Research Products Inc
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Electrical Research Products Inc
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Publication of FR746686ApublicationCriticalpatent/FR746686A/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
FR746686D1932-12-021932-12-02
Improvements to devices intended for recording sound
ExpiredFR746686A
(en)