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DE1037522B
|
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Circuit arrangement for telecommunications systems with call seekers
|
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DE1036931B
|
|
Circuit arrangement for manually operated telephone extension systems without individual subscriber relays
|
|
DE1024607B
|
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Push button switch
|
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DE1029048B
|
|
Intercom system with equal subscriber stations
|
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DE1016770B
|
|
Arrangement for the fee count
|
|
DE1011939B
|
|
Circuit arrangement for telecommunications systems to reduce the number of lines between the control center and the exchange
|
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DE1015065B
|
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Circuit arrangement for determining subscribers in private branch exchanges
|
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DE1007372B
|
|
Circuit arrangement for testing in telecommunications systems
|
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DE1030864B
|
|
Exercise facility for training in telegraph and / or radio communication
|
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DE1000875B
|
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Procedure for performing temporary switchovers on subscriber switching routes in telecommunications exchanges
|
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GB812966A
|
|
Circuit arrangement for telephone installations with line finders
|
|
DE956061C
|
|
Device for displaying fees
|
|
DE970177C
|
|
Procedure for performing temporary switchovers on subscriber switching routes in telecommunications exchanges
|
|
DE969177C
|
|
Arrangement for recording the fees incurred by the call stations of a private branch exchange
|
|
DE969954C
|
|
Circuit arrangement for telecommunications systems with call seekers
|
|
DE1002795B
|
|
Telephone for two positions of use
|
|
DE939455C
|
|
Circuit arrangement for telecommunications systems, in particular telephone systems with call seekers
|
|
US2794861A
|
|
Combination telephone switch and dial
|
|
DE1006014B
|
|
Circuit arrangement for telephone systems whose subscriber lines can be connected either to a series system or to a line dialer system
|
|
DE954797C
|
|
Dialing and call facility for telecommunications systems
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