| 摘要 |
<p>1473550 Piston rings J DECHAVANNE 19 Dec 1974 [19 Dec 1973] 55308/74 Heading F2T A packing assembly for a stepped groove in a piston or piston-rod housing includes a resilient ring 1, a continuous ring 2 of P.T.F.E. or polythene and two tapered rings 3 of hard material, such as an acetal resin. Cavity 5 may be omitted.</p> |
