| http://www.w3.org/ns/prov#value | - Referring to FIG. 4 there is illustrated an embodiment substantially the same as that of FIG. 3 except in this embodiment, the retaining walls or abutments of FIG. 1 for retaining the cassette 17 from movement in the direction 28 will be adjacent the back wall 16, and shown as 48 and 52.
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