Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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 FR793119ApublicationCriticalpatent/FR793119A/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
FR793119D1934-07-281935-07-26Dispositif pour l'enregistrement de courants électriques modulés par le son
ExpiredFR793119A
(fr)