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VERNIS PYROLAC SOC D
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VERNIS PYROLAC SOC D
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Application filed by VERNIS PYROLAC SOC DfiledCriticalVERNIS PYROLAC SOC D
Application grantedgrantedCritical
Publication of FR50439EpublicationCriticalpatent/FR50439E/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
FR50439D1939-02-091939-02-09Machine pour la fabrication de disques de phonographe
ExpiredFR50439E
(fr)