#transmission_system__transmission  the gears that transmit power from an automobile engine via the driveshaft to the live axle
  supertype:  gear_mechanism__gear  a mechanism for transmitting motion by gears for some specific purpose (as the steering gear of a vehicle)
  subtype:  automatic_transmission  four-wheel_drive  standard_transmission
  part of:  drive_line_system
  part:  clutch.coupler  a coupling that connects or disconnects driving and driven parts of a driving mechanism
     part:  clutch_pedal__clutch  a pedal that operates a clutch
  part:  fluid_drive__fluiddrive  an automotive power coupling
  part:  gearbox__gear_case  the shell (metal casing) in which a train of gears is sealed
     part:  transmission_shaft  rotating shaft that transmits rotary motion from the engine to the differential

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