| http://www.w3.org/ns/prov#value | - Frame 20 is made of polyvinylchloride, aluminum or other dimensionally stable, strong material, preferably machinable and preferably integrally formed of a single piece of rigid material to provide a stable mount for a cam shaft 22 to be discussed below and to precisely orient bores 20e for reception of a plurality of longitudinally movable shafts 24.
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