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    Horizontal distance between the centerlines of the rails that support the trolley on a double girder bridge.

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    A crane similar to an overhead crane except that the bridge for carrying the trolley or trolleys is rigidly supported on two or more legs running on fixed rails or other runway.

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    A hoist specifically designed to lift the water controlling gates in a dam.

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    Device to convert high speed motor shaft rotation to usable output shaft speed for hoist, trolley or bridge motion.

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    The principal horizontal beams of the crane bridge which supports the trolley and is supported by the end trucks.

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    A "job specific" load handling device, designed to pick up bulk material, containers, barrels or drums. Actuation can be mechanical, electrical or hydraulic.

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    An accidental conducting connection between the electrical circuit or equipment and the earth or some conducting body that serves in place of the earth.