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Application filed by Joseph Dr Engl, Hans Vogt, Joseph MassollefiledCriticalJoseph Dr Engl
Application grantedgrantedCritical
Publication of AT91101BpublicationCriticalpatent/AT91101B/de
AT91101D1921-04-111921-04-11Vorrichtung zur Herstellung von Photophonogrammen, insbesondere für die Zwecke der akustischen Kinematographie.
AT91101B
(de)