RUARO RT-7-S3 Surface Milling & Grinding Machine. Operator's Instructions RUARO RT-7-S3 Surface Milling and Grinding Machine for Motor Vehicle Cylinder heads, Blocks and other Flat Surfaces. Operator's Instructions with Electrical and Hydraulic Schematics. Manufacturers: RUARO Models: RT-7-S3 RT 7 S3 Contents: Operators Manual Electrical Diagrams