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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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Engineering & Computer Science
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Computer Networks & Wireless Communication
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Keying Circuit Devices
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Structure Of Telephone Exchanges
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Arrangements For Transmission Of Measured Signals
(AREA)
GB20383/33A1932-08-011933-07-19Improvements in or relating to methods for the electrical signalling of instrument readings
ExpiredGB407592A
(en)