Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A bellows is a device for delivering pressurized air in a controlled quantity to a controlled location. Basically, a bellows is a deformable container which has an outlet nozzle. When the volume of the bellows is decreased, the air escapes through the outlet. A bellows typically has a separate inlet, and valves or flaps to ensure that air enters only through the inlet and exits only through the outlet.

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