Emergency clock pulse standby system

Claim 1

AN EMERGENCY STANDBY SYSTEM FOR CLOCK PULSE GENERATORS COMPRISING: FIRST AND SECOND GENERATING MEANS FOR GENERATING RESPECTIVELY A FIRST AND SECOND SERIES OF PULSES, MEANS FOR SYNCHRONIZING SAID GENERATING MEANS CONNECTED THEREBETWEEN, NORMALLY CLOSED GATING MEANS COR CONNECTING THE OUTPUT OF SAID FIRST GENERATING MEANS TO THE SYSTEM OUTPUT ONLY WHEN OPERATED FROM ITS NORMALLY CLOSED CONDITION, NORMALLY OPEN GATE MENS FOR DISCONNECTING THE OUTPUT OF SAID SECOND GENERATING MEANS TO SAID SYSTEM OUTPUT ONLY WHE OPERATED FROM ITS NORMALLY OPEN CONDITION, FREQUENCY SENSITIVE FILTER MEANS INTERCONNECTED BETWEEN THE OUTPUT OF SAID FIRST GENERATOR MEANS, AND CONTROL MEANS, SAID CONTROL MEANS BEING RESPONSIVE TO VARIATIONS OF THE FREQUENCY OF SAID FIRST SERIES OF PULSES BEYOND A SELECTED RANGE FOR SWITCHING SAND NORMALLY OPEN GATING MEANS AND SAID NORMALLY CLOSED GATING MEAN FROM THEIR SAID NORMAL CONDITIONS SO THAT SAID OUTPUT OF SAID FIRST GENERATING MEANS IS CONNECTED TO SAID SYSTEM OUTPUT WHEN SAID VARIATIONS OF THE FREQUENCY OF SAID FIRST SERIES OF PULSES EXIST.