| http://www.w3.org/ns/prov#value | - Other particles that may be embedded in fissures in accordance with the practice of this invention include graphite and molybdenum disulfide, for their excellent lubricating properties, and various elemental metals are metal compounds including titanium, zirconium, molybdenum, hafnium, selenium, antimony, barium oxide, barium carbide, beryllium, beryllium oxide, boron nitride, cerium, chromium, co
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