a lid member including an elongated plate portion dimensioned to extend along said {TAIL ~ straight side} of the casing and to fit closely between said projecting edge portions, and ears projecting from {HEAD ~ opposite ends} of said plate portion at right angles to the latter for disposition against said end portions of the peripheral wall 
a lid member including an elongated plate portion dimensioned to extend along said { TAIL ~ straight side } of the casing and to fit closely between said projecting edge portions , and ears projecting from { HEAD ~ opposite ends } of said plate portion at right angles to the latter for disposition against said end portions of the peripheral wall
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