prov:value
| - Illustrative of useful materials which can be employed as non-conductive materials in the practice of the invention are ceramics such as metal and non-metal oxides, such as magnesium oxide, aluminates, calcium oxide, titanium oxide, aluminum oxide, zirconium oxide, oxide containing clays, silicon dioxide, tungsten oxide; synthetic ceramics such as silicon carbides, aluminum carbide, tungsten carbi
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