[Class : 6] Metal Rings; Screw Rings Of Metal; Metal Structures; Rings Of Metal (Unworked/Worked); Seamlessly Rolled Rings Of Metal (Unworked/Worked); Ring Rolled Parts Of Metal.[Class : 7] Bearings; Engine Bearings; Ball Bearings; Roller Bearings; Piston Rings; Ball Rings For Machines; Rings For Bearings; Rings (Parts Of Machines); Ball Rings For Machine Tools; Ball Bearing...