#helmet  a protective headgear made of hard material to resist blows
  supertype:  #headdress__headdres  clothing for the head
  subtype:  #batting_helmet  #crash_helmet  #football_helmet  #hard_hat  #headpiece  #space_helmet
  part:  #beaver.armor_plate  a movable piece of armor on a medieval helmet used to protect the lower face

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