| 摘要 |
The invention is a seal for the gap between two parts which may or may not rotate with respect to each other which seal comprises a body of flexible material placed in a groove of one part and having a lip pressed against the surface of the other part, said lip having a reinforcement of a more rigid material which towards the surface engaged by the lip has ridges of a smaller surface area than the areas turned away from said surface, said reinforcement eventually extending through some or all other parts of the seal to prevent extrusion into the gap.
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