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    Means suspended from the crane operating the controllers from the floor or other level beneath the crane.

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    Distance through the center of a drum or sheave from center to center of a rope passed about the periphery.

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    A reversing control which has identical characteristics for both directions of motor rotation.

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    A control function which accomplishes braking by reversing the motor line voltage polarity or phase sequence.

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    High capacity crane generally used to perform turbine maintenance in a power plant.

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    An assembly containing overload and under voltage protection for all crane motions.