DIRECT STATION SELECTION PRIVATE INTERCOM EXCHANGE SYSTEM

A group of modified key telephone station sets is uniquely interconnected with substantially conventional key telephone equipment to provide a number of PBX-like functions. Each station set is provided with a privacy circuit which under all conditions prevents a station from gaining access to any li...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	JETZT J,US, SULLIVAN J,US
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION
Online-Zugang:	Volltext bestellen
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