Selective signaling system

Claim 1

A SELECTIVE SIGNALING SYSTEM COMPRISING A TRANSMITTER AND A PLURALITY OF RECEIVERS, MEANS AT SAID TRANS MITTER FOR PRODUCING A SIGNAL OF PARTICULR FREQUENCY, MEANS AT SAID TRANSMITTER FOR PRODUCING A PLURALITY OF SIGNALS OF FREQUENCIES DIFFERENT FROM EACH OTHER AND FROM SAID PARTICULAR FREQUENCY FOR IDENTIFYING DISCRETE RECEIVERS, MENANS AT SAID TRANSMITTER FOR ALTERNATELY RENDERING SAID PARTICULAR SIGNALS MEANS OR SAID DIFFERENT SIGNAL MEANS EFFECTIVE TO TRANSMIT THE RESPECTIVE PARTICULR OR DIFFERENT SIGNALS TO SAID RECEIVERS, AND FREQUENCY SELECTIVE MEANS AT EACH OF SAID RECEIVERS TO PASS SAID PARTICULAR SIGNAL RECEIVED THEREAT TO PRODUCE AN OUTPUT SIGNAL WITH AT LEAST A PREDETERMINED LEVEL FOR SIMULTANEOUSLY ESTABLISHING NON-OPERATIVE CONDITIONS IN ALL SAID FREQUENCY SELECTIVE RECEIVERS, SAID MEANS AT SAID RECEIVERS IDENTIFIED BY ONE OF SAID DIFFERENT SIGNALS SELECTIVELY REJECTING SAID ONE DIFFERENT SIGNAL RECEIVED THEREAT TO PRODUCE AN OUTPUT SIGNALS WITH A LEVEL LESS THAN SAID PREDETERMINED LEVEL OF SAID PARTICULAR SIGNAL FOR SELECTIVELY CHANGING THE NONOPERATIVE CONDITION AT EACH OF SAID RECEIVERS TO AN OPERATIVE CONDITION, SAID RECEIVERS NORMALLY BEING OPERATIVE IN THE ABSENCE OF SIGNALS OF SAID PARTICULAR FREQUENCY.