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