| http://www.w3.org/ns/prov#value | - In FIGS. 1 and 2, reference numeral 1 denotes an insulating substrate, such as alumina, mullite or the like, reference numeral 2 denotes a thin film electrodes made of a metal, such as gold, silver or platinum, reference numeral 3 denotes a thin film gas sensitive layer consisting of metal oxides with a major component being tin oxide, and reference numeral 4 denotes a thick film electrodes made o
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