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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
FR62513D1951-11-121952-01-25Appareil automatique d'alerte émettant des appels sur un réseau téléphonique
ExpiredFR62513E
(fr)