(under the class definition) Apparatus in which the rotating working member either engages another rotating member or a cylinder casing or part thereof thereby barring the passage of working fluid therepast and a relief passage is provided at the convergence of these elements for the removal of the unexhausted residual working fluid normally confined thereat in the operation of the device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
183, and the subclasses thereunder for devices in which the working fluid enroute to or from the working chamber passes through at least a portion of the rotating working member.
