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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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FR644243D1927-04-271927-04-27Système de commande à distance par distributeurs synchronisés
ExpiredFR644243A
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