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Application filed by Syndikat J C Douw S Patente De, Direktoer Johan Willem Vlielan, Rentier Christiaan Henri Henny, Rentier Max Adolf HennyfiledCriticalSyndikat J C Douw S Patente De
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DK44593D1929-02-021929-12-07Lydtragt eller Lydkanal til Anordninger, der tjener til Lydgengivelse, samt Fremgangsmaade til dens Fremstilling.
DK44593C
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