a casing including spaced parallel walls and a peripheral wall therebetween for containing a magnetic tape, said casing having a substantially straight side along which said peripheral wall has an opening for access to {HEAD ~ the tape} in {TAIL ~ said casing}, said peripheral wall having end portions substantially at right angles to said straight side at opposite ends of the latter, and said parallel walls having edge portions projecting beyond said peripheral wall along said straight side 
a casing including spaced parallel walls and a peripheral wall therebetween for containing a magnetic tape , said casing having a substantially straight side along which said peripheral wall has an opening for access to { HEAD ~ the tape } in { TAIL ~ said casing } , said peripheral wall having end portions substantially at right angles to said straight side at opposite ends of the latter , and said parallel walls having edge portions projecting beyond said peripheral wall along said straight side
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