#crane.lifting_device lifts and moves heavy objects; lifting tackle is suspended from a pivoted boom that rotates around a vertical axis
supertype: lifting_device__liftingdevice a device for lifting heavy loads
subtype: davit a crane-like device (usually one of a pair) for suspending or lowering equipment (as a lifeboat)
subtype: derrick.crane a simple crane having lifting tackle slung from a boom
subtype: transporter a crane for moving material with dispatch as in loading and unloading ships
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