Circuit arrangement for evaluating changes in a given pulse-pause ratio of received signals
DE1270994B
Circuit arrangement for message lines with two transistors
DE1271206B
Circuit arrangement for telephone PBXs with target selection
DE1267256B
Circuit arrangement for generating a control voltage dependent on a direct current
DE1272359B
Circuit arrangement for maintaining an essentially constant load on the output of a pulse generator
DE1260353B
Circuit arrangement for signaling systems with quiescent current monitored star lines
DE1265001B
Circuit arrangement for signaling systems
DE1248116B
Circuit arrangement for dialing the extension subscribers of a ú¯-digit switching system
DE1231597B
Circuit arrangement for sending an alarm to several groups of alarm receivers
DE1255735B
Circuit arrangement for telephone private branch exchanges with touch and pulse dialing subscribers, of which the former form the individual dialing codes by grounding the voice wires via diodes
DE1255147B
Wiring arrangement for frames of communications technology
DE1245440B
Circuit arrangement for telephone extension systems with transmission of the counting pulses over the test and occupancy wires
DE1244873B
Circuit arrangement for special connection devices assigned to preferred intercom stations in telephone extension systems
DE1228674B
Circuit arrangement for generating audio frequency pulses
DE1257878B
Circuit arrangement for the through-connection test of switching stages connected one behind the other in telecommunications switching systems, in particular teleprinter systems
DE1262834B
Circuit arrangement for the elimination of external voltage influences in signal receiving centers
DE1238963B
Circuit arrangement for a subscriber circuit designed as a plug-in unit in telephone systems
DE1242275B
Circuit arrangement with busy signal sets for telecommunications, in particular telephone extension systems
DE1255733B
Procedure for the temporary prevention of unauthorized calls via fully authorized and / or remote-authorized call stations in private telephone exchange systems
DE1242709B
Target dialing add-on for a telecommunications, in particular telephone exchange
