| http://www.w3.org/ns/prov#value | - In embodiments, the first material 31 is a ceramic, such as iridium oxide (???IROX???), titanium oxide (???TIOX???), TINOX (titanium oxide mixed with nickel oxide) or oxides of niobium (???Nb???), tantalum (???Ta???), all platinum group family metals, ruthenium (???Ru???), platinum, ehidium, palladium, and asminium, or mixtures thereof.
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