Selective call system

Claim 1

A MOBILE TELEPHONE STATION ADAPTED TO RECEIVE A TIMED BINARY CODE TRANSMITTED BY MODULATION OF TWO WIRE FREQUENCIES AND TO IDENTIFY THE SPECIFIC CALL-SIGN OF SAID MOBILE INCLUDING STATION, COMPRISING: MEANS INCLUDING A MONO-STABLE DEVICE TRIGGERED BY A "START" BIT OF A CALL FOR A PREDETERMINED TIME-PERIOD COVERING THE DURATION OF THE ENTIRE CALL, MEANS INCLUDING A CLOCK GENERATOR CONTROLLED BY SAID DEVICE TO OPERATING DURING THE SAID TIME-PERIOD, MEANS FOR GENERATING A LOCAL CALL-SIGN INCLUDING A BIT COUNTER AND A TRANSLATOR ADAPTED TO DELIVER A MARKING VOLTAGE FOR EACH BIT COUNTED AT A CORRESPONDING OUTPUT, A COMPOSING DEVICE EACH ELEMENT OF WHICH IS ASSOCIATED WITH THE TRANSLATOR OUTPUT TO CONTROL SAID OUTPUT IN ACCORDANCE WITH THE CODE OF THE LOCAL CALL-SIGN, A COMPARATOR FOR COMPARING THE SIGN OF EACH BIT OF THE SELECTIVE CALL WITH A CORRESPONDING BIT PROVIDED BY THE LOCAL CALL-SIGN GENERATOR, AND A COUNTER FOR COUNTING THOSE BITS WHICH ARE CONCORDANT TO DELIVER A CALL MARKING WHEN THE NUMBER OF CONCORDANT BITS EQUALS THE NUMBER OF BITS IN THE CALL, THEREBY TO OPERATE A CALL CIRCUIT.