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Application filed by Bell Telephone MfgfiledCriticalBell Telephone Mfg
Publication of CH58100ApublicationCriticalpatent/CH58100A/de
CH58100A1911-06-301911-06-30Einrichtung für Fernsprechanlagen zum wahlweisen Anruf von an eine gemeinsame Leitung angeschlossenen Stellen
CH58100A
(de)