Abstract: A saddletree constructed of upper and lower plastic shells which are secured together. A first strap passes inside the saddletree below the swell and pommel area and a second strap passes inside the saddletree below the cantle area, both may be attached to the upper surface of the lower shell near the centerline of the saddletree and depend from the saddletree on both sides of the attachment of other saddle rigging components.

Abstract: A multi-purpose mining machine comprising a self-propelling power unit with a boom pivotally connected to the power unit for raising and lowering movements, the boom having two parts one connected to the power unit and the other being connected to said one part so as to be slewable relative thereto about an axis at 90.degree. to the axis of the connection of the boom to the power unit, the boom other part being in part downwardly inclined with a power shaft rotatably housed in the boom other part with drive means for the power shaft, and extensible means to raise and lower the boom and further extensible means to slew the boom one part relative to the other part thereof.

Abstract: The invention provides a bypass around virtually the entire periphery of a piston in a two cycle engine without substantially increasing costs or obsoleting production tooling. This is done by reshaping a cavity formed inside an engine casting to enlarge the crank case opening and to provide three oppositely displaced bypasses. The fourth side of the piston is open to the exhaust port. Therefore, virtually the entire perimeter of the piston is bypassed to greatly increase power by improved breathing.