The upper casing member is provided, at a rear portion of {HEAD ~ each} of {TAIL ~ 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 
of
The upper casing member is provided , at a rear portion of { HEAD ~ each } of { TAIL ~ 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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL 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