Thus, the lid member is movable, by a combination of the pivoting and bodily displacement thereof, between a closed position in which the plate portion is between the projecting edge portions at the straight side of the casing for closing {HEAD ~ the opening} therein and an opened position in which the plate portion of the lid is disposed at the outside of the top or bottom {TAIL ~ wall} of the casing adjacent the respective edge portion 
Thus , the lid member is movable , by a combination of the pivoting and bodily displacement thereof , between a closed position in which the plate portion is between the projecting edge portions at the straight side of the casing for closing { HEAD ~ the opening } therein and an opened position in which the plate portion of the lid is disposed at the outside of the top or bottom { TAIL ~ wall } of the casing adjacent the respective edge portion
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