#valve.device  device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
  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"
  part of:  #brass.wind_instrument__bras  a wind instrument that consists of a brass tube (usually of variable length) blown by means of a cup-shaped or funnel-shaped mouthpiece

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