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