| 摘要 |
In porudcing many split-piston rings, having at least one inward reduced surface, to have a much bigger than a inside ring makes the inward reduced ring surface contact, and spherical surface rotated around it, (4) until a ring surface has a smoothly curved cross-section through all the rings' width, sufficient pressure is to be applied inward ring so that a inward reduced surface makes closely touched, in accordance with the axis of a ring.
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