A magnetic tape cassette includes a casing with a substantially straight side along which a peripheral wall has an opening for access to magnetic tape contained in the casing between its top and bottom walls which have edge portions projecting beyond the peripheral wall along the straight side, and a lid member having an elongated plate portion dimensioned to extend along {TAIL ~ the straight side} of the casing and to fit closely between the projecting edge portions and ears projecting from {HEAD ~ opposite ends} of the plate portion for disposition against respective end portions of the peripheral wall 
A magnetic tape cassette includes a casing with a substantially straight side along which a peripheral wall has an opening for access to magnetic tape contained in the casing between its top and bottom walls which have edge portions projecting beyond the peripheral wall along the straight side , and a lid member having an elongated plate portion dimensioned to extend along { TAIL ~ the straight side } of the casing and to fit closely between the projecting edge portions and ears projecting from { HEAD ~ opposite ends } of the plate portion for disposition against respective end portions of the peripheral wall
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