US PATENT SUBCLASS 418 / 199
.~ Multiple units

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

191  DF  INTERENGAGING ROTATING MEMBERS {9}
199.~ Multiple units {1}
200  DF  .~.~> With axially spaced working members

DEFINITION

Classification: 418/199

(under subclass 191) Apparatus comprising two or more spaced apart sets or groups of interengaging rotary members each set or group being, per se, capable of performing a pump or motor operation.