Prevention of power harmonic interference in bridged subscriber loops

Claim 1

IN A TELEPHONE SYSTEM, THE COMBINATION OF A CENTRAL OFFICE, A PLURALITY OF SUBSCRIBER STATIONS, A NETWORK OF MULTIPLY-CONNECTED SUBSCRIBER LOOPS EACH TERMINATED BY ONE OF SAID STATIONS AND EACH HAVING SERIALLY INSERTED THEREIN A BALANCED-WOUND SATURABLE REACTOR BRIDGE LIFTER, EACH OF SAID STATIONS COMPRISING A RINGING CIRCUIT RESPONSIVE TO RINGING SIGNALS FROM SAID CENTRAL OFFICE, SAID RINGING CIRCUIT BEING CONNECTED BETWEEN ONE OF THE CONDUCTORS OF ITS RESPECTIVE LOOP AND A POINT OF REFERENCE POTENTIAL, THEREBY UNBALANCING ITS RESPECTIVE LOOP, AND LINEAR IMPEDANCE MEANS CONNECTED AROUND THE BALANCED WINDINGS OF EACH OF SAID REACTOR BRIDGE LIFTERS TO PROVIDE AN ALTERNATE PATH IN EACH OF SAID LOOPS WHEN INACTIVE, SAID IMPEDANCE MEANS PRESENTING A SUBSTANTIAL IMPEDANCE TO VOICE BAND CURRENTS IN RELATION TO THE IMPEDANCE PRESENTED TO SAID CURRENTS BY ITS ASSOCIATED REACTOR WHEN UNSATURATED.