#gear_mechanism__gear  a mechanism for transmitting motion by gears for some specific purpose (as the steering gear of a vehicle)
  supertype:  mechanism  device consisting of a piece of machinery; has moving parts that perform some function
  subtype:  first_gear__firstgear__first__low_gear__lowgear__low  the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving
  subtype:  gearset  a set of gears
  subtype:  high_gear__high  a forward gear with a gear ratio giving high vehicle velocity for a given engine speed
     subtype:  overdrive  a high gear used at high speeds to maintain the driving speed with less output power
  subtype:  park.gear_mechanism  a gear position that acts as a parking brake; "the put the car in park and got out"
  subtype:  reverse  the gears by which the motion of a machine can be reversed
  subtype:  second_gear__second  the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle; "he had to shift down into second to make the hill"
  subtype:  steering_gear  a gear that couples the the steering wheel to the steering linkage of a motor vehicle
  subtype:  third_gear__thirdgear__third  the third from the lowest forward ratio gear in the gear box of a motor vehicle; "you shouldn't try to start in third gear"
  subtype:  transmission_system__transmission  the gears that transmit power from an automobile engine via the driveshaft to the live axle
     subtype:  automatic_transmission__automatictransmission__automatic_drive__automaticdrive  a transmission that automatically changes the gears according to the speed of the car
     subtype:  four-wheel_drive__4WD  a transmission that provides power directly to all four wheels of a motor vehicle
     subtype:  standard_transmission__stick_shift__stickshift  a transmission that is operated manually with a gear lever and a clutch pedal

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