Abstract: A small portion of oil being circulated by the engine's pump is constantly diverted to a specially-constructed filter where solid contaminant particles are intercepted. The oil still under pressure is then directed to a dehydration chamber wherein its pressure is reduced and it is directed through a heat-exchange pipe and drops onto a horizontal spreader plate pierced by a multiplicity of small apertures distributed over its relatively large area. Spreading of the oil in a thin layer over the plate effects vaporization of liquid contaminants therein. The vapors are drawn off from the top of the chamber by vacuum and dispensed to ambient air or recirculated to the carburetor. Purified oil flows by gravity from the chamber to the crankcase.

Abstract: A hitch for connecting a tractor to an agricultural implement, enabling relative angular movement of the two, about three mutually normal axes and characterized by great strength, rigidity and ease of fabrication without machining, from readily obtainable forms and shapes.