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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
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FR419228D1910-07-081910-07-08Dispositif de signalisation électrique à batterie centrale
ExpiredFR419228A
(fr)