Again, in response to positive going pulses in such train of pulses, {HEAD ~ transistor Q2} is driven from {TAIL ~ a non conducting condition} to a conducting condition, as shown in FIG 4B 
is driven from
Again , in response to positive going pulses in such train of pulses , { HEAD ~ transistor Q2 } is driven from { TAIL ~ a non conducting condition } to a conducting condition , as shown in FIG 4B
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH