(under the class definition) Device provided with an operator having kinematical ratios such that a full movement of the input member is incapable of moving the closure through its full range of motion, so that relatively short input strokes impart serial movements to the closure to move it from one extreme position to the other, e.g., closures such as freight car doors movable step-by-step by a pry bar or crow bar.
SEE OR SEARCH THIS CLASS, SUBCLASS:
267, for a pedal or treadle operator requiring two actuations to effect a single complete movement of the closure.
