| 摘要 |
<p>1532384 Piston rings SEALED POWER CORP 27 July 1977 [8 Sept 1976] 31478/77 Heading F2T A circular spacer-expander 28 for use in a piston oil control ring is of sinusoidal form with alternating inner and outer crowns 30, 32, each inner crown 30 having attached to it a support pad 36 with its outermost edge disposed outwardly of the adjacent outer crown 32.</p> |
