US PATENT SUBCLASS 417 / 69
.~.~.~ With diverse pump

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
66  DF  .~ Contact or entrainment within rotary impeller {4}
68  DF  .~.~ Liquid ring {1}
69.~.~.~ With diverse pump

DEFINITION

Classification: 417/69

(under subclass 68) Apparatus including a second pump which is of a different basic type from the liquid ring pump.

(1) Note. The liquid ring pump may be merely a priming pump for the second pump.