| http://www.w3.org/ns/prov#value | - Reference numeral 15 shows main electrodes in ohmic contact with the respective surfaces of the regions 13, numeral 16 the other common main electrode in ohmic contact with the main surface 17 and numeral 18 a light permeable film of such a material as silicon dioxide which covers the main surface 12 except those portions of the surface provided with the one main electrodes 15 and the films 14.
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