Selective ringing decoder system

Claim 1

IN A SELECTIVE SIGNALING SYSTEM USING CALL SIGNALS REPRESENTED BY PERMUTATIONS OF A GROUP OF INTEGERS AND ENCODED IN A TRANSMITTED SIGNAL BY ALTERNATING THE FREQUENCY THEREOF WITH CLOSELY SPACED FREQUENCY TRANSITIONS TO FORM AN INTEGER SIGNAL AND REMOTELY SPACED TRANSITIONS TO SEPARATE SUCCESSIVE INTEGER SIGNALS, A RECEIVING STATION INCLUDING A SIGNAL DEVICE, AN ELECTROMECHANICAL DECODING DEVICE HAVING A STEPPING ACTUATOR AND A DECODING ACTUATOR, SAID DECODING DEVICE BEING OPERATIVE TO CONTROL THE SIGNAL DEVICE ONLY WHEN THE STEPPING ACTUATOR IS ENERGIZED WITH SUCCESSIVE PULSE TRAINS, EACH HAVING A PREDETERMINED NUMBER OF PULSES AND ONLY WHEN THE DECODING ACTUATOR IS ENERGIZED WITH A PROLONGED PULSE CONTINUING THROUGH EACH TRAIN OF PULSES, AND A DECODER CIRCUIT RESPONSIVE TO THE TRANSMITTED SIGNAL AND INCLUDING AN INTEGER SIGNAL CHANNEL CONNECTED WITH THE STEPPING ACTUATOR AND DEVELOPING, IN RESPONSE TO EACH SIGNAL FREQUENCY TRANSITION, AN ELECTRICAL PULSE OF LESSER DURATION THAN THE INTERVAL BETWEEN SAID CLOSELY SPACED TRANSITIONS, AND INCLUDING A DECODING PULSE CHANNEL CONNECTED WITH THE DECODING ACTUATOR, AND DEVELOPING IN RESPONSE TO EACH SIGNAL FREQUENCY TRANSITION, A PROLONGED PULSE OF GREATER DURATION THAN THE INTERVAL BETWEEN THE CLOSELY SPACED TRANSITIONS BUT OF LESSER DURATION THAN THE INTERVAL BETWEEN THE REMOTELY SPACED TRANSITIONS.