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Schaltungsanordnung fuer den wahlweisen Anschluss einer von zwei an einer gemeinsamen Leitung liegenden Teilnehmerstellen unter Wahrung des Gespraechgeheimnisses
Telephonrelaissystem, bei dem die von einer Sprechstelle zur anderen gesandten Sprechstroeme Vorrichtungen in Taetigkeit setzen, die die angesprochene Stelle selbsttaetig in den Stromkreis der verstaerkten Sprechstroeme einschalten