Binary code signalling system having a binary counter at the receiver responsive to a selected code

Claim 1

A SELECTIVE SYSTEM FOR PROVIDING SELECTIVE CALLING OF ONE OF PLURALITY OF STATIONS BY A CODE CALL SIGNAL WHICH PROVIDES ZERO AND ONE PULSES SEQUENCED ACCORDING TO A BINARY CODE, SAID SELECTIVE SYSTEM INCLUDING IN COMBNATION, A BINARY COUNTER CIRCUIT INCLUDING A SERIES OF TWO-STATE STAGES, SAID COUNTER CIRCUIT HAVING A STARTING CONDITION IN WHICH THE FIRST OF SAID SERIES IN ENABLED AND ALL OF THE OTHER STAGES OF SAID SERIES ARE DISABLED. AND ENABLING CIRCUIT CONNECTED BETWEEN EACH TWO SUCCESSIVE STAGES OF SAID COUNTER CIRCUIT AND APPLYING AN ENABLING VOLTAGE FROM THE PRECEDING ONE TO THE FLOWING ONE OF SAID LOW SUCCESSIVE STAGES FOR ENABLING SAID FOLLOWING STAGE TO RESPOND TO ONE OF SAID PULSES, FIRST AND SECOND SIGNAL LINES, INPUT MEANS FOR RECEIVING THE CODE CALL SIGNAL AND APPLYING THE ZERO PULSES TO SAID FIRST SIGNAL LINE AND THE ONE PULSES TO SAID SECOND SIGNAL LINE, AND CIRCUIT MEANS SELECTIVELY CONNECTING SAID TWO-STATE STAGES TO ONE OF SAID FIRST AND SECOND SIGNAL LINES IN A PREDETERMINED SEQUENCE, SUCH THAT SAID COUNTER CIRCUIT IS ADVANCED THROUGH A CYCLE TO PROVIDE A CONTROL VOLTAGE AT THE LAST STAGE IN SAID SERIES IF THE NUMBER AND SEQUENCE OF ZERO AND ONE PULSES PROVIDE BY SAID CODE CALL SIGNAL CORRESPONDS TO THE NUMBER OF STAGES IN SAID COUNTER CIRCUIT AND THE SEQUENCE IN WHICH SAID STAGES ARE CONNECTED TO SAID SIGNAL LINES, AND MEANS RESPONSIVE TO SAID CONTROL VOLTAGE TO PROVIDE AN INDICATION OF THE RECEPTION OF THE CODE CALL.