Circuit arrangement for the transmission of a time-dependent parallel call to microphone units of a telephone system
DE1258304B
Circuit arrangement for the detection of moving bodies in a room monitored by a room protection device
DE1254892B
Arrangement for adjusting the transmission wheels and the pivotable return comb relative to the numerical rollers of a counter bearing the heart curves
DE1271767B
Circuit arrangement for converting coded digit information into a decade pulse series with a subsequent specific pulse series pause
DE1260551B
Circuit arrangement for connecting a ringing current source in telephone systems
DE1254707B
Circuit arrangement for an electronically controlled telephone private branch exchange with connection set and call switch relays assigned to the individual participants
DE1279116B
Circuit arrangement for the determination and storage of touch dialing codes according to the diode-earth method in telecommunication systems, in particular telephone systems
DE1257880B
Device for counting the call fees and their display in currency units
DE1271779B
Circuit arrangement for the transmission of ringing current by means of number switch actuation
DE1261174B
Charge counter for telephones
DE1258638B
Zero setting device for counting devices
DE1263861B
Circuit arrangement for the line of the exchange call to a partially electronic small private branch exchange
DE1263074B
Circuit arrangement for generating a sequence of pulses at a time interval which is a multiple of the time interval between periodically occurring clock pulses
DE1262366B
Device for switching electrical extensions in four-wire telephony lines
DE1254696B
Circuit arrangement for a telephone series or parallel system with line selection
