| http://www.w3.org/ns/prov#value | - said means having a recess therein including an annular mounting groove; a onepiece, circular, resiliently deformable combination impact and seal ring in said recess said ring having an inner surface, an outer surface and front and rear faces, said ring having an annular mounting flange thereon received in said groove and having one side thereof coplanar with the rear face of the ring, means for r
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