US PATENT SUBCLASS 418 / 206.9
.~.~.~ Using specific material

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}
206.9.~.~.~ Using specific material

DEFINITION

Classification: 418/206.9

Using specific material:

(under subclass 206.1) Apparatus wherein the chamber or the rotary interengaging members are composed of a particular substance.