| http://www.w3.org/ns/prov#value | - Accordingly, the insulating layer 31 may be made of A1.sub.2O.sub.3, SiN, TiO.sub.2, or other ceramics, and particulate reinforced chemical resistant polymers and mixtures thereof, and produced by well-known methods such as dipping, spin coating, spraying and sputtering.
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