Internal-combustion engines having a cylinder and working piston reciprocating therein, but irrespective of other structural features, cycle, or mode of operation, in which the working cylinder partakes of a continuous rotary motion about a fixed axis as the working piston reciprocates therein and engines including a plurality of working cylinders each coming within the terms of this definition, the engine in question not coming within the terms of the definition of the subclass following this.
SEE OR SEARCH CLASS
91, Motors: Expansible Chamber Type,
176, 197 and 472+, for expansible chamber motors of the rotating cylinder type.
92, Expansible Chamber Devices,
54+, for an expansible chamber device having a rotating cylinder.
