While the gates 9 and 11 are shown symbolically as coincidence gates, {TAIL ~ other suitable means} such as {HEAD ~ field effect transistor amplifiers} configured to function as coincidence gates could be used 
While the gates 9 and 11 are shown symbolically as coincidence gates , { TAIL ~ other suitable means } such as { HEAD ~ field effect transistor amplifiers } configured to function as coincidence gates could be used
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH