The upper casing member is provided, at {TAIL ~ a rear portion} of each of {HEAD ~ both sides} thereof, with grasping or holding means which are isolated or apart from the slider, so as not to hinder sliding movement of the slider, and through which the casing is grasped 
The upper casing member is provided , at { TAIL ~ a rear portion } of each of { HEAD ~ both sides } thereof , with grasping or holding means which are isolated or apart from the slider , so as not to hinder sliding movement of the slider , and through which the casing is grasped
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH