The slider is slidably mounted on the lower casing member so as to cover at least a part of {HEAD ~ a bottom} and {TAIL ~ a side} of the lower casing member 
The slider is slidably mounted on the lower casing member so as to cover at least a part of { HEAD ~ a bottom } and { TAIL ~ a side } of the lower casing member
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH