(under subclass 200) Apparatus provided with distinct means to vary the level of pressure of the air or combustible material prior to combustion.
(1) Note. The means of this subclass is distinct structure, such as a bypass valve, e.g., and excludes the cooperating elements which normally and inherently produce compression in a rotary engine.
SEE OR SEARCH CLASS
417, Pumps,
283, for a rotary expansion chamber device having a condition responsive bypass or relief valve.
418, Rotary Expansible Chamber Devices,
159, for a rotary expansible chamber device provided with means adjacent to the fluid inlet or outlet for controllably modifying the flow of fluid.
