| http://www.w3.org/ns/prov#value | - Acetyl is a preferred material for constructing the end cap 200 in the instance in which the cartridge body structure 114 and holding member 220 are made of a polystyrene for several reasons, in part because acetyl makes an excellent bearing and in part because frictional engagement between unlike materials (that is, the styrene and the acetyl) provide quiet operation of the brakes.
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