| http://www.w3.org/ns/prov#value | - Specifically, the metal is a single tungsten (W), titanium (Ti), tantalum (Ta), molybdenum (Mo), cobalt (Co), hafnium (Hf), nickel (Ni), zirconium (Zr), chromium (Cr), vanadium (V), palladium (Pd) or platinum (Pt), an alloy of these materials, or a compound using these materials as main components.
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