#steering_system__steering_mechanism  a mechanism by which something is steered (especially a motor vehicle)
  supertype:  mechanism  device consisting of a piece of machinery; has moving parts that perform some function
  part:  steering_gear  steering_linkage  steering_wheel
  subtype:  helm.steering_system  steering mechanism for a vessel; a mechanical device by which a vessel is steered
     subtype:  wheel.helm  a circular helm to control the rudder of a vessel
  subtype:  power_steering__powersteering__powerassistedsteering  automotive steering where engineer power amplifies the torque applied to the steering wheel
  subtype:  rudder.steering_system  (nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel

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