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Priority claimed from DEST16970Aexternal-prioritypatent/DE1133752B/de
Priority claimed from DEST17002Aexternal-prioritypatent/DE1122108B/de
Priority claimed from DEST17015Aexternal-prioritypatent/DE1120517B/de
Application filed by Bell Telephons Mfg CompanyfiledCriticalBell Telephons Mfg Company
Publication of BE608795ApublicationCriticalpatent/BE608795A/fr