| 摘要 |
1282633 Lapping INTERNATIONAL HARVESTER CO 14 Aug 1969 [6 Sept 1968] 40665/69 Heading B3D [Also in Division F2] A split torsion-type piston ring 20a is compressed into a holding fixture 46 and lapped on a flat surface 50 to form at the junction between the end face 38 and the inner periphery a planar primary sealing band having a flatness of 10 to 5 light bands or even 2 light bands. |
