| http://www.w3.org/ns/prov#value | - The invention further provides in a system for transmitting information in an A.C. electricity supply system by reducing the instantaneous value of the A.C. supply voltage during the same small fractional part of each of a selection of cycles of the supply voltage waveform, said part including a time of voltage zero, a receiver comprising: an integrator which integrates the instantaneous value of
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