The fail safe circuit also includes circuitry for preventing {HEAD ~ inadvertent communication} of the signal from the input terminal through the series switching network to {TAIL ~ the output terminal} when one of the switching circuits is in a short circuited state or condition 
to
The fail safe circuit also includes circuitry for preventing { HEAD ~ inadvertent communication } of the signal from the input terminal through the series switching network to { TAIL ~ the output terminal } when one of the switching circuits is in a short circuited state or condition
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH