| http://www.w3.org/ns/prov#value | - This combined spring and seal 29 is made of readily flowable material such as rubber and is preferably polygonal in cross section, of substantially equal transverse dimensions, and is provided with convex corners lobes and opposed concave sides, the degrees of concavity and convexity of which and the maximum and minimum radial dimensions of which have predetermined values within critical ranges as
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