| http://www.w3.org/ns/prov#value | - In certain exemplary embodiments of the present invention, seal rings 147 comprise elastomeric ???O??? rings; in certain of these exemplary embodiments, seal rings 147 may be made from a material such as a fluoro-elastomer, nitrile rubber, VITON???, AFLAS???, TEFLON???, or the like.
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