US PATENT SUBCLASS 418 / 206.7
.~.~.~ With bearings

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

191  DF  INTERENGAGING ROTATING MEMBERS {9}
205  DF  .~ Like rotary members {1}
206.1  DF  .~.~ Having each radial protuberance of like dimension {8}
206.7.~.~.~ With bearings

DEFINITION

Classification: 418/206.7

With bearings:

(under subclass 206.1) Apparatus comprising means to support, guide, and reduce the friction between moving parts.