CH413915A - Wechsel-Lautsprechanlage
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Wechsel-Lautsprechanlage
Info
Publication number
CH413915A
CH413915ACH422663ACH422663ACH413915ACH 413915 ACH413915 ACH 413915ACH 422663 ACH422663 ACH 422663ACH 422663 ACH422663 ACH 422663ACH 413915 ACH413915 ACH 413915A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL291114DpriorityCriticalpatent/NL291114A/xx
Priority to BE631336Dprioritypatent/BE631336A/xx
Application filed by Neumann Elektronik GmbhfiledCriticalNeumann Elektronik Gmbh
Priority to CH422663Aprioritypatent/CH413915A/de
Priority to FR932208Aprioritypatent/FR1375014A/fr
Publication of CH413915ApublicationCriticalpatent/CH413915A/de
Telegraphenfernvermittlungssystem, bei dem die Orsverbindungen mittels Tonfrequenz ueber Fernsprechleitungen und die Fernverbindungen unter Zweischenschaltung von Umsetzerschaltungen ueber normale Telegraphenkanaele betrieben werden