{HEAD ~ Two electrodes} are attached to the crystal with {TAIL ~ amplifier means} and a signal processing system connected to one of the electrodes to provide an ultrasonic receiver 
{ HEAD ~ Two electrodes } are attached to the crystal with { TAIL ~ amplifier means } and a signal processing system connected to one of the electrodes to provide an ultrasonic receiver
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH