In the casing 10 of {HEAD ~ the illustrated embodiment} constructed as described above, both the slider 20 and front cover 22 are positioned to close {TAIL ~ the opening} of the casing body 12 during non use of the magnetic tape cassette, to sealingly keep the magnetic tape element within the casing 
In the casing 10 of { HEAD ~ the illustrated embodiment } constructed as described above , both the slider 20 and front cover 22 are positioned to close { TAIL ~ the opening } of the casing body 12 during non use of the magnetic tape cassette , to sealingly keep the magnetic tape element within the casing
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH