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Application filed by Hanns Ing BlaschkefiledCriticalHanns Ing Blaschke
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Publication of AT136636BpublicationCriticalpatent/AT136636B/de
AT136636D1933-01-191933-01-19Einrichtung zur Erzielung von Störgeräuschen bei münzkassierenden Telephonzellen zur Verhinderung unbezahlter Gespräche.
AT136636B
(de)