#wheelwork  mechanical device including an arrangement of wheel in a machine (especially a train of gears)
  supertype:  #mechanical_device  mechanism consisting of a device that works on mechanical principles
  subtype:  #gearing__gears__gear__geartrain__power_train__powertrain__train  wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed; "the fool got his tie caught in the geartrain"
     subtype:  #epicyclic_train__epicyclictrain__epicyclic_gear_train  a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
     subtype:  #reduction_gear__reductiongear  gearing that reduces an input speed to a slower output speed

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