#lawn_mower__mower  garden tool for mowing grass on lawns
  supertype:  garden_tool__lawn_tool  used for working in gardens or yards
  subtype: {hand_mower power_mower}
  part:  blade.cutting_implement  the flat part of a tool or weapon that (usually) has a cutting edge
     part:  knife_edge__knifeedge__cutting_edge__cuttingedge  the sharp cutting side of the blade of a knife

No statement uses or specializes lawn_mower; click here to add one.