(under the class definition) Apparatus wherein a working member* (1) is itself so constructed as to float in or on a working fluid or (2) has collapsible walls expandable to an operative shape by filling with a fluent material.
SEE OR SEARCH CLASS
60, Power Plants,
495+, for motors having a buoyant working member motivated by the vertical rise and fall of the surface of a body of fluid.
440, Marine Propulsion,
98+, for a marine vessel having a buoyant propeller.
