| http://www.w3.org/ns/prov#value | - The engine shown in FIGS. 21 and 22 may operate at higher temperatures, therefore materials such as boron nitride, sapphire, zirconium, and or alumina may be required to construct the housings, casings, manifolds, centrifugal impeller, exhaust turbines, common shafts, associated hardware, and surfaces in direct contact with the plasma.
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