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
Original Assignee
Electrical Research Products Inc
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Publication date
Application filed by Electrical Research Products IncfiledCriticalElectrical Research Products Inc
Application grantedgrantedCritical
Publication of FR754800ApublicationCriticalpatent/FR754800A/fr
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
G11B3/68—Record carriers
G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
FR754800D1932-10-291933-04-27Procédé et appareil pour la fabrication de disques vierges destinés à l'enregistrement du son
ExpiredFR754800A
(fr)