FR582613A - Dispositif permettant l'intercommunication et la signalisation de fin de conversation dans les tableaux centraux téléphoniques à circuit primaire
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Dispositif permettant l'intercommunication et la signalisation de fin de conversation dans les tableaux centraux téléphoniques à circuit primaire
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H04M9/00—Arrangements for interconnection not involving centralised switching
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Signal Processing
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FR582613D1924-06-101924-06-10Dispositif permettant l'intercommunication et la signalisation de fin de conversation dans les tableaux centraux téléphoniques à circuit primaire
ExpiredFR582613A
(fr)