#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
  subtype:  friction_clutch  a clutch in which one part turns the other by the friction between them
  part:  clutch_pedal
  part of:  transmission_system__transmission  the gears that transmit power from an automobile engine via the driveshaft to the live axle
     part of:  drive_line_system__drive_line__driveline  mechanism that transmits power from the engine to the driving wheels of a motor vehicle
        part of:  motor_vehicle__motorvehicle__automotive_vehicle  a self-propelled wheeled vehicle that does not run on rails

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