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Filing date
Publication date
Application filed by Daniel Tefi ApparatebaufiledCriticalDaniel Tefi Apparatebau
Publication of CH220254ApublicationCriticalpatent/CH220254A/de
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
B29D17/00—Producing carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records; Producing record discs from master stencils
G—PHYSICS
G11—INFORMATION STORAGE
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
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
CH220254D1939-06-281940-06-03Verfahren zum Herstellen von Schallfilmen mit mechanischer Schallschrift und Prägematrize zur Ausübung dieses Verfahrens.
CH220254A
(de)