| http://www.w3.org/ns/prov#value | - Exemplary of such substrates are metals such as aluminium, copper, silver or gold; semi-conductors such as germanium, silicon or GaAs; inorganic materials which are provided with conductive coatings, for example glass or quartz which is provided, for example, with a metal coating or with a semi-conductor layer, for example with indium-tin oxide (ITO); or plastics materials such as Teflon???, polye
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