From an apparatus standpoint, {TAIL ~ the invention} comprises {HEAD ~ a sensor assembly} carried by an upstanding wall member having an elongated opening 
From an apparatus standpoint , { TAIL ~ the invention } comprises { HEAD ~ a sensor assembly } carried by an upstanding wall member having an elongated opening
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH