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Publication of FR735581ApublicationCriticalpatent/FR735581A/fr
H04Q1/00—Details of selecting apparatus or arrangements
H04Q1/18—Electrical details
H04Q1/30—Signalling arrangements; Manipulation of signalling currents
H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
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Computer Networks & Wireless Communication
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FR735581D1932-04-201932-04-20Perfectionnements apportés aux procédés d'appel et de commutation en téléphonie
ExpiredFR735581A
(fr)