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Compressors, Pumps, and Turbines                              193






















                     Rotary Piston                      Liquid Ring
                   Source: Reference  5.5             Source: Reference 5.59



























                  Rotary Lobe                           Rotary Vane
                Source: Reference 5.4                Source: Reference 5.6



            Figure  5.2  Positive-displacement vacuum  pumps.  References  with per-
            mission.








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