| http://www.w3.org/ns/prov#value | - For example, preferred performance-tuning materials might include one or a combination of two or more materials selected from the group consisting of fluoropolymers, silicones, polyolefins, carbides, nitrides, oxides, diamond, diamond-like carbon, and combinations thereof; and even more particularly might include one or a combination of two or more materials selected from the group consisting of p
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