#clutch.coupler  a coupling that connects or disconnects driving and driven parts of a driving mechanism
  supertype:  #coupler__coupling  a mechanical device that serves to connect the ends of adjacent objects
  part:  #clutch_pedal
  part of:  #transmission_system
  subtype:  #friction_clutch  a clutch in which one part turns the other by the friction between them
     subtype:  #cone_clutch__cone_friction_clutch  a friction clutch in which the frictional surfaces are cone-shaped
     subtype:  #disk_clutch  a friction clutch in which the frictional surfaces are disks
     subtype:  #slip_clutch__slip_friction_clutch  a friction clutch that will slip with the torque is too great

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