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 the tape in said casing, said peripheral wall having end portions substantially at right angles to said straight side at opposite ends of the latter, and said {HEAD ~ parallel walls} having {TAIL ~ edge portions} projecting beyond said peripheral wall along said straight side 
having
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 the tape in said casing , said peripheral wall having end portions substantially at right angles to said straight side at opposite ends of the latter , and said { HEAD ~ parallel walls } having { TAIL ~ edge portions } projecting beyond said peripheral wall along said straight side
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