Legal status (The legal status 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 status listed.)
G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B5/00—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied
G08B5/22—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied using electric transmission; using electromagnetic transmission
G08B5/36—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
Schaltungsanordnung fuer Fernsprechanlagen, insbesondere mit Waehlerbetrieb, in welchen Einrichtungen zur Erkennung der anrufenden Leitungen vorgesehen sind
Schaltungsanordnung fuer UEberwachungsstellen in Telegraphenanlagen mit einer fuer mehrere Telegraphenleitungen gemeinsam angeordneten UEberwachungseinrichtung