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Application filed by Carl RoehrichfiledCriticalCarl Roehrich
Application grantedgrantedCritical
Publication of AT121408BpublicationCriticalpatent/AT121408B/de
AT121408D1929-07-191929-07-19Film oder Platte für die Schallwiedergabe nach dem lichtelektrischen Verfahren und Verfahren zu deren Herstellung.
AT121408B
(de)