| http://www.w3.org/ns/prov#value | - aesthetics and ergonomics; the pieces can be made in different colors and/or types of surface finishes; the rotating piece with integral cam can be made smaller or larger and the cam groove can be varied to create various stroke lengths for the reciprocating cam follower; the rotating piece can be made with a shaft of various sizes, in place of the female threads, for mounting in chucks and colle
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