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H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
Dispositif pour la determination de l'etat d'un appareil et en particulier de l'etat ouvert ou ferme d'un appareil electrique a l'aide de contacts auxiliaires