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PCE
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CPC Subgroup
H04Q 9/08

Calling by using continuous AC

Full Title

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 > Calling by using continuous AC

2 direct subcodes

Child Classifications

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  • H04Q 9/10 using single different frequencies
  • H04Q 9/12 using combinations of frequencies