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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
H04Q9/08—Calling by using continuous AC
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FR794005D1935-07-161935-07-16Perfectionnements aux systèmes sélecteurs électriques
ExpiredFR794005A
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