The upper casing member is provided at {HEAD ~ a rear portion} of {TAIL ~ both sides} thereof with holding members through which the casing is grasped 
of
The upper casing member is provided at { HEAD ~ a rear portion } of { TAIL ~ both sides } thereof with holding members through which the casing is grasped
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH