#whistle  acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound
  supertype:  acoustic_device  signaling_device
  subtype:  boat_whistle  a whistle on a boat that is sounded as a warning
  subtype:  factory_whistle__factorywhistle  a whistle at a factory that is sounded to announce times for starting or stopping work
  subtype:  steam_whistle__steamwhistle  a whistle in which the sound is produced by steam; usually attached to a steam boiler

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