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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
H04Q9/04—Arrangements for synchronous operation
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FR658311D1927-06-231928-06-15Installation pour la commande à distance d'appareils de contact électriques
ExpiredFR658311A
(fr)