Fail-safe warning system

Claim 1

A FAIL-SAFE DISCRIMINATING CONTROL CIRCUIT FOR CONTINUOUSLY ENERGIZING A DEVICE ONLY AS LONG AS DIFFERENT FREQUENCY, EFFECTIVELY NON-SPACED, CONTROL SIGNAL, WHICH ARE SUBJECT TO ABNORMAL ABSENCE, CONTINUE NORMALLY TO RECUR ALTERNATELY, COMPRISING: (A) A PLURALITY OF PARALLEL CHANNELS HAVING A COMMON INPUT FOR RECEIVING ALL SAID CONTROL SIGNALS, (B) A PLURALITY OF DISCRIMINATION-RECTIFICATION MEANS RESPECTIVELY IN SAID CHANNELS FOR EFFECTIVELY ASSIGNING SAID CONTROL SIGNALS RESPECTIVELY TO SAID CHANNELS BY DISCREMINATING AGAINST ALL SAID CONTROL SIGNALS EXCEPT A RSPECTIVE ONE WHICH IS THEREBY PASSED AS A RECTIFIED RECURRENT OUTPUT, (C) A PLURALITY OF NORMALLY OPEN SWITCH MEANS RESPECTIVELY COUPLED TO SAID DISCRIMINATION-RECTIFICATION MEANS AND ALTERNATELY RECLOSED BY AND FOR THE EFFECTIVE DURATION OF THE SAID OUTPUTS OF SAID DISCRIMINATION-RECTIFICATION MEANS RESPECTIVELY, EACH SAID SWITCH MEANS REOPENING BETWEEN RECURRENCES OF THE SAID RESPECTIVE RECURRENT OUTPUT AND (B) MEANS COUPLING THE OUTPUTS OF SAID SWITCH MEANS TOGETHER FOR CONTINUOUSLY ENERGIZING SAID DEVICE AS LONG AS ALL SAID SWITCH MEANS CONTINUOUSLY RECLOSE ALTERNATELY BECAUSE OF THE SAID NORMAL RECURRENCE OF SAID CONTROL SIGNALS BUT FOR INTERMITTENTLY ENERGIZIN SAID DEVICE IF ANY ONE OF SAID SWITCH MEANS DOES NOT RECLOSE BECAUSE OF THE ABNORMAL ABSENCE OF THE RESPECTIVE CONTROL SIGNAL AND FOR PREVENTING ENERGIZATION OF SAID DEVICE IF NON OF SAID SWITCH MEANS RECLOSES BECAUSE OF THE ABNORMAL ABSENCE OF ALL SAID CONTROL SIGNALS.