| http://www.w3.org/ns/prov#value | - However, the cover 12, the housing 16, and the cover plate 82 can be made from any number of other materials, such as steel, aluminum, iron, or other metals, urethane, fiberglass or other synthetic materials, composites, refractory materials such as glass, ceramic, etc., and even relatively unusual materials such as wood or stone.
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