Bellows

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  1. An instrument with an air chamber and flexible sides used for compressing and/or directing a current of air. Crispin
  2. An expansible metal device containing a fluid that will volatilize at some desired temperature, expand the device, and open or close an opening or a switch; used in controls and steam traps. Strock, 2

Source: Dictionary of Mining, Mineral, and Related Terms


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