#caterpillar_tread__caterpillartread__caterpillar_tracks  a belt around wheels to grip rough ground
  supertype:  belt.loop  endless loop of flexible material between two rotating shafts or pulleys
  subtype:  half_track  caterpillar tread goes around only rear wheels
  part of:  bulldozer__dozer  large powerful tractor; a large blade in front flattens areas of ground
  part of:  Caterpillar__cat  (trademark) a tractor that is driven by caterpillar tracks
  part of:  army_tank__tank__armored_combat_vehicle  an enclosed armored military vehicle; has a cannon and moves on caterpillar treads

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