US PATENT SUBCLASS 418 / 201.2
.~.~ With valve

Current as of: June, 1999
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418 /   HD   ROTARY EXPANSIBLE CHAMBER DEVICES

191  DF  INTERENGAGING ROTATING MEMBERS {9}
201.1  DF  .~ Helical or herringbone {4}
201.2.~.~ With valve

DEFINITION

Classification: 418/201.2

With valve:

(under subclass 201.1) Apparatus wherein there is provided a means to regulate fluid flow.