| http://www.w3.org/ns/prov#value | - a cam and cam follower, one of the cam and cam follower being fixed to the handle so that movement of the handle causes movement of the cam relative to the cam follower, and the other of the cam and cam follower being linked to the first or second portion so that movement of the cam relative to the cam follower causes movement of the first and second portions relative to each other;
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