| 摘要 |
A sealing device comprising a main body section defining at least one sealing surface, and comprised of a flexible material a secondary anti-extrusion section adjoined to the exterior of the main body section and comprised of a material more rigid than that of the main body section, and a primary anti-extrusion section adjoined to the secondary anti-extrusion section adjacent an exterior surface thereof and comprised of a metallic material more rigid than that of the secondary anti-extrusion section.
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