The on off state of switch 56 is controlled by switching signals 57 coupled to {HEAD ~ a control terminal} 58 of {TAIL ~ switch} 56 
of
The on off state of switch 56 is controlled by switching signals 57 coupled to { HEAD ~ a control terminal } 58 of { TAIL ~ switch } 56
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH