System for remotely controlling the operation of a power distribution network

Claim 1

A LOAD CONTROL SYSTEM COMPRISING: (A) A POWER LINE; (B) A PLURALITY OF OSCILLATORS FOR SUPPLYING CARRIER SIGNALS OF DIFFERENT FREQUENCIES TO SAID POWER LINE; (C) A RELAY MEANS ASSOCIATED WITH EACH OSCILLATOR; (D) MEANS INTERPOSED BETWEEN SAID VARIOUS RELAY MEANS AND SAID POWER LINE FOR CONNECTING EACH RELAY MEANS TO SAID POWER LINE SO AS TO APPLY A CARRIER SIGNAL TO SAID LINE HAVING THE FREQUENCY OF THE OSCILLATOR WITH WHICH THE PARTICULAR RELAY MEANS THAT IS THEN CONNECTED IS ASSOCIATED; (E) MEANS FOR TRIGGERING SAID LAST-MENTIONED MEANS INTO OPERATION A PRESCRIBED NUMBER OF TIMES SO AS TO INTERRUPTEDLY APPLY THAT CARRIER SIGNAL TO SAID LINE AND THEREBY PROVIDE A SERIES OF PULSES FOR TRANSMISSION ALONG SAID LINE; (F) MEANS FOR PRESELECTING THE SEQUENCE SAID RELAY MEANS ARE TO BE ENERGIZED; (G) MEANS CONNECTED TO SAID DETERMINING MEANS FOR STARTING SAID TRIGGERING MEANS EACH TIME A RELAY MEANS IS ENERGIZED;