A proximity switch may be employed to indicate {HEAD ~ the mold} being in position in front of {TAIL ~ the sound detector} 
A proximity switch may be employed to indicate { HEAD ~ the mold } being in position in front of { TAIL ~ the sound detector }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL