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Publication of DE259071CpublicationCriticalpatent/DE259071C/de
Vorrichtung zum selbsttaetigen Ein- und Ausschalten eines Stromkreises beim Auftreten und Aufhoeren von Sprechstroemen oder anderen elektrischen Schwingungen, insbesonder e fuer Parlographen, Diktaphone, Telephonographen u. dgl.