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