#guard.device__safety  a device designed to prevent injury
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  fender  a low metal guard to confine falling coals to a hearth
  subtype:  safety_catch__safety_lock  guard consisting of a locking device that prevents a weapon from being fired

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