#cultivator__tiller  a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)
  supertype:  farm_machine  a machine used in farming
  subtype:  harrow  a cultivator that pulverizes or smoothes the soil
     subtype:  disk_harrow__disc_harrow  a harrow with a series of disks set on edge at an angle

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