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Publication of FR770512ApublicationCriticalpatent/FR770512A/fr
H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
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FR770512D1934-03-211934-03-21Dispositif pour la signalisation d'alarmes au moyen des lignes téléphoniques usuelles
ExpiredFR770512A
(fr)
Dispositif pour enregistrer chez l'abonné demandeur ou au central des réseaux de téléphone automatique des signaux donnés au moyen du cadran ou autres signalisateurs