| http://www.w3.org/ns/prov#value | - The insulating substrate 2 is formed in such a manner that a single layer of a not-yet sintered ceramic such as AlN, Al2 O3, mullite, glass ceramic, crystallized glass, Si3 N4, or the like or a lamination of such layers is sintered so as to have a thickness of, for example, about 0.5-4 mm.
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