Also shown are {HEAD ~ the exterior surface} 23 of the top portion 7 and the exterior surface 24 of the bottom portion of {TAIL ~ the housing} 
Also shown are { HEAD ~ the exterior surface } 23 of the top portion 7 and the exterior surface 24 of the bottom portion of { TAIL ~ the housing }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL