Abstract: This patent specification discloses an engine exhaust gas reflux apparatus constructed so as to purify exhaust gas coming out of various engines mounted on vehicles or ships for preferably preventing NO.sub.x from being discharged in the atmosphere.The engine exhaust gas reflux apparatus has a technical construction which removes dust particles and impurities contained in exhaust gas by means of a dust collector installed at the discharge port of the exhaust manifold, draws purified exhaust gas into the intake manifold and lowers combustion temperature produced when the engine fuel burns to eliminate NO.sub.x out of exhaust gas coming out of the exhaust manifold.

Abstract: A ski edging device for a snowmobile includes an articulable joint connected between the snowmobile body and the skis to permit rotation of the skis relative to the body about a steering axis and to permit rotation of the skis relative to the body about a camber axis to control the angle of the inclination of the skis during turning maneuvers to prevent lateral side slipping of the snowmobile. A first control arm is secured to a portion of the articulable joint to move with rotation of the skis about the steering axis and a second control arm is secured to a second portion of the articulable joint to move with rotation of the skis about the camber axis. A cable and pulley system is connected between the first and second control arms such that a turning movement of the skis about the steering axis causes the first control arm to vary the position of the second control arm to rotate the skis about the camber axis to provide the desired edging effect.