| http://www.w3.org/ns/prov#value | - The device of claim [7] I wherein said insulating material is a member selected from the group consisting of silicon monoxide, calcium fluoride and magnesium fluoride and said persistent electrochromic material is a member selected from the group consisting of a metal stannate; an oxide of a metal of Groups IV-B, V-B, and VI-B; and a Lanthanide series metal oxide. 10.
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