SECTION I - CLASS DEFINITION
Mechanical combinations, contrivances, or devices constituting
portions of machines, instruments and apparatus and consisting of
two or more fixed and movable parts so combined that the motion
of one compels a completely controlled or constrained motion of
the other according to a law of operation inherent in and depending
on the nature of the combination, and also the elemental parts of
such machines not provided for in other machine element classes.
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