| http://www.w3.org/ns/prov#value | - That is, the tube 410 and the cover member 413 may be formed of a substance such as tungsten carbide (WC), beryllium steel (CuBe), Hastelloy C-276, silicon nitride (Si3N4), zirconia (ZrO2), brass, aluminum, austenite-series stainless steel YHD50, a non-magnetic metal such as SUS300, SUS304 and SUS316, ceramic or a synthetic resin.
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