| 摘要 |
1,140,229. Piston rings; seals. HEPWORTH & GRANDAGE Ltd. 11 Aug., 1967, No. 36030/66. Addition to 1,099,235. Headings F2B and F2T. The spacer ring for the sealing rings 7 is provided with a cross-section which is closed or substantially closed instead of being U-shaped as in the parent Specification. |
