#mill__grinder  machine that processes materials by grinding or crushing
  supertype:  #machine  any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
  subtype:  #cider_mill__cidermill  mill that extracts juice from apples to make apple cider
  subtype:  #coffee_mill__coffee_grinder  a mill that grinds roasted coffee beans
  subtype:  #flour_mill__flourmill  a mill for grinding grain into flour
  subtype:  #gristmill  a mill for grinding grain (especially the customer's own grain)
  subtype:  #meat_grinder.mill__meatgrinder  a mill for grinding meat
  subtype:  #pepper_mill__pepper_grinder  a mill for grinding pepper
  subtype:  #quern  a primitive stone mill for grinding corn by hand
  subtype:  #spicemill  a mill for grinding spices
  subtype:  #treadwheel__treadmill  a mill that is powered by men or animals walking on a circular belt or climbing steps
  subtype:  #water_mill__watermill  a mill powered by a water wheel
  subtype:  #windmill  a mill that is powered by the wind

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