Navigation aiding receivers

Claim 1

A NAVIGATION AIDING RADIO RECEIVER ADAPTED TO UTILIZE THE TRANSMISSION OF A NAVIGATION AIDING TRANSMITTING SYSTEM, SAID RECEIVER COMPRISING A PLURALITY OF RECEIVER SECTIONS EACH FED WITH A DIFFERENT ONE OF THE ALLOCATED FREQUENCIES RECEIVED FROM SAID SYSTEM; A PLURALITY OF OSCILLATORS, ONE IN EACH SECTION AND ALL OF THE SAME NOMINAL FREQUENCY EQUAL TO A SUB-MULTIPLE OF THE BASIC COMMON DENOMINATOR FREQUENCY OF SAID SYSTEM; TIMED SWITCH MEANS; MEANS CONTROLLED BY SAID TIMED SWITCH MEANS FOR CONTROLLING THE OSCILLATOR IN EACH SECTION TO LOCKED RELATIONSHIP WITH RESPECT TO THE SIGNALS OF ALLOCATED FREQUENCY FED TO THAT SECTION DURING TIMES WHEN SAID SIGNALS ARE PRESENT IN SAID SECTION AND FOR CONTROLLING SAID OSCILLATOR TO LOCKED RELATIONSHIP WITH RESPECT TO SIGNALS OF SAID SUBMULTIPLE FREQUENCY AT OTHER TIMES, SAID SIGNALS OF SUBMULTIPLE FREQUENCY BEING DERIVED FROM SIGNALS BEING RECEIVED AT SAID OTHER TIMES; AND MEANS SEPARATELY RESPONSIVE TO THE PHASE RELATION BETWEEN OSCILLATIONS FROM THE OSCILLATOR IN THE SECTION TO WHICH THE FREQUENCY ALLOCATED TO THE MASTER STATION OF THE SYSTEM IS FED AND THE OSCILLATIONS FROM EACH OF THE OSCILLATORS IN THE SECTIONS TO WHICH THE FREQUENCIES OF THE SLAVE STATIONS OF THE SYSTEM ARE FED, FOR GIVING HYPERBOLIC POSITION LINE INDICATIONS.