US PATENT SUBCLASS 91 / 266
.~.~ Oscillating working member

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

218  DF  CYCLICALLY OPERABLE {34}
265  DF  .~ Relatively movable inlet and exhaust valves {6}
266.~.~ Oscillating working member

DEFINITION

Classification: 91/266

(under subclass 265) Apparatus in which the working member moves back and forth about an axis to describe an arc of not more than 360 degrees.