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Publication of FR952595ApublicationCriticalpatent/FR952595A/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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FR952595D1946-09-121947-08-29Perfectionnements aux instruments et appareils téléphoniques
ExpiredFR952595A
(fr)