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FR2642251A1
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Process for recognising a two-frequency telephone tone
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FR2640246A1
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Adaptable margin
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Synchronization arrangement for a private digital automatic switch connected to an isdn network
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Security locking device
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Process for transcoding digital image data "bitmap"
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Mechanical electrical security assembly in a telephone station or terminal
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Telephone telecontrol arrangement for mono or multifunctional installation
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Backup battery power supply
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TIME SWITCHING SYSTEM
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Telephone handset and arrangements for connection of a datacom terminal to a telephone line acoustically by means of such a handset
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Protection and remote powering system and device for equipment connected by two transformers to a four-wire transmission link
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Electronic device with threshold for microphone with linear electrical efficiency of telephone station or terminal
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Larsen anti-effect device for telephone set
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COMMUNICATION ROUTING METHOD FOR DIGITAL TIME AUTOMATORY NETWORK NETWORK
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DEVICE FOR PROTECTING TERMINAL EQUIPMENT IN A TELEPHONE SUBSCRIBER
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Electrical safety socket for momentary connection of an apparatus with a domino-type terminal board
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Message signalling device for telephone installation with analogue sets and set equipped for this purpose
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System for connecting telephone subscribers organized around a digital timer
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IE861177L
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Sound responsive process
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FR2598015A1
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Plastron with lights for control device with luminous signaling
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