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