Contactless method for controlling the thickness of a preparation layer applied to a yarn and circuit arrangement for carrying out said method
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Emergency information communication unit for road side use, is in form of a weather proof housing that contains the system electronics
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Device for the arrangement of loudspeakers of an assembly of loudspeakers on planar surfaces exposed to the rain, especially on flat railway wagons for the transport of motor vehicles
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Emergency call information device, in particular emergency call information column
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Arrangement for indicating an operating failure in an electrical communications device, esp. an emergency and/or information device
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Electronic information device, particularly emergency column
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Information emergency call system
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Emergency call system
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Information emergency call system
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Device for the transmission of call and occupancy status signals from two-way or intercom systems with line selection via a two-wire transmission line
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Method and device for establishing and terminating a connection in an emergency calling system
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Method and apparatus for coding and decoding of an analog low frequency signal into a PCM format, especially for transmitting speech information in intercom apparatus
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Key-controlled multi-line telephone system for alternate, simultaneous or loud-speaking and communication
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Telephone party line circuit for connecting two stations to one line - uses bistable relay activating setting and resetting devices for alternately coupling e.g. telephone, answering machine or facsimile to common line
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Testing emergency call system with subscribers - generating preset number of test pulses within preset time interval and transmitting to evaluator circuit
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Electronic changeover circuit for telephone extensions - allows connection of 2 telephone extensions to one telephone line by detecting loop current of line in use
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Changeover switching device for a telephone device for the connection of two telephone stations to a common telephone line
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Selector device for a telephone unit for connecting a plurality of telephone stations to a common telephone line
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Device for reading magnetic cards and for storing the data read
DE3701919C1
Method for reducing the energy consumption of a telephone device, the supply of which is supplied with electrical energy via the telephone line, and device for carrying out the method
