| http://www.w3.org/ns/prov#value | - Such materials are known in the art and include: a metal such as titanium or magnesium or a metal alloy such as aluminum or steel, high resistance steel type P, 36.2; or manganese steel alloy; stainless steel type A 315.1, Marine grade quality; or an aluminum/magnesium alloy; or other material or combinations of material having similar density and strength.
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