#farm_machine  a machine used in farming
  supertype:  machine  any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
  subtype:  cultivator__tiller  a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)
     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
  subtype:  harvester__reaper  farm machine that gathers a food crop from the fields
     subtype:  reaper_binder__binder  a machine that cuts grain and binds it in sheaves
     subtype:  combine  harvester that heads and threshes and cleans grain while moving across the field
     subtype:  header.harvester  a machine that cuts the heads off grain and moves them into a wagon
  subtype:  haymaker__hay_conditioner__hayconditioner  a farm machine that treats hay to cause more rapid and even drying
  subtype:  thresher__thrasher__threshing_machine__threshingmachine  a farm machine for separating seeds or grain from the husks and straw

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