{TAIL ~ A train} of positive going pulses is fed to the base electrode of transistor Q1 by controller 14 via {HEAD ~ line} 15 
{ TAIL ~ A train } of positive going pulses is fed to the base electrode of transistor Q1 by controller 14 via { HEAD ~ line } 15
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH