| http://www.w3.org/ns/prov#value | - However, if desired the base 20 and/or ring 18 may be made of stainless steel, INVAR??? alloy, a trademark of Imphy S.A. of Paris, France, KOVAR??? alloy, NI-SPAN-C??? alloy, a trademark of Huntington Alloys Corporation of Huntington, West Virginia, or other material with relatively low coefficients of thermal expansion and corrosion resistance suitable to the environment in which this system will
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