The casing also includes a slider which is slidably mounted on the casing body or frame so as to be slidable in a lateral direction of the casing body or frame, and is arranged so as to cover at least a part of {TAIL ~ a bottom} and {HEAD ~ both sides} of the lower casing member 
The casing also includes a slider which is slidably mounted on the casing body or frame so as to be slidable in a lateral direction of the casing body or frame , and is arranged so as to cover at least a part of { TAIL ~ a bottom } and { HEAD ~ both sides } of the lower casing member
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