Internal-combustion engines having a cylinder and a working piston reciprocating therein, but irrespective of other structural features, cycle, or mode of operation, in which means are provided for causing the engine to run in either direction at the will of the operator and subordinate mechanism for accomplishing the same result, but not disclosed in connection with all the elements necessary to form a complete and operative engine.
(1) Note. In this connection it should be observed that engines working upon a two-stroke cycle are frequently capable of operating in either direction without addition to or change in the elements necessary to the operation thereof,
and this especially true of the engines in subclasses 71, 73 and 74.
