The transducer elements are impressed with voltage through the printed circuit and {HEAD ~ ground electrode} to issue {TAIL ~ ultrasonic waves} 
to issue
The transducer elements are impressed with voltage through the printed circuit and { HEAD ~ ground electrode } to issue { TAIL ~ ultrasonic waves }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL