This invention relates to {HEAD ~ level measurement} and is applicable, in particular, to level measurement using {TAIL ~ ultrasonic reflection} 
This invention relates to { HEAD ~ level measurement } and is applicable , in particular , to level measurement using { TAIL ~ ultrasonic reflection }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL