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Publication of FR1036764ApublicationCriticalpatent/FR1036764A/fr
H04Q1/00—Details of selecting apparatus or arrangements
H04Q1/18—Electrical details
H04Q1/30—Signalling arrangements; Manipulation of signalling currents
H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
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Computer Networks & Wireless Communication
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FR1036764D1951-03-141951-03-14Système de transmission d'impulsions de signalisation
ExpiredFR1036764A
(fr)