#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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