| 摘要 |
1,246,596. Piston rings. NIPPON PISTON RING CO. Ltd. 13 May, 1970 [20 May, 1969], No. 23137/70. Heading F2T. A cast iron piston ring 1 has an annular groove 2 in its outer peripheral surface filled with stainless steel 3. The stainless steel is sprayed into the groove and has a radial thickness of 0À2 to 2À0 mm.
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