The casing includes {TAIL ~ a casing body} having an upper casing member and {HEAD ~ a lower casing member} joined together 
The casing includes { TAIL ~ a casing body } having an upper casing member and { HEAD ~ a lower casing member } joined together
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH