Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Compagnie Generale de Signalisation
Original Assignee
Compagnie Generale de Signalisation
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Filing date
Publication date
Application filed by Compagnie Generale de SignalisationfiledCriticalCompagnie Generale de Signalisation
Application grantedgrantedCritical
Publication of FR510424ApublicationCriticalpatent/FR510424A/fr
H04M19/00—Current supply arrangements for telephone systems
H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
FR510424A1919-04-141920-02-21Perfectionnements apportés aux appareils électriques de signalisation
ExpiredFR510424A
(fr)