| http://www.w3.org/ns/prov#value | - Note that in the above two techniques, as a usable catalytic element, in addition to nickel (Ni), an element such as germanium (Ge), iron (Fe), palladium (Pd), tin (Sn), lead (Pb), cobalt (Co), platinum (Pt), copper (Cu), or gold (Au) may be used.
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