| http://www.w3.org/ns/prov#value | - Examples of first materials for the first structure include stainless steel (e.g., 316L and 304L stainless steel, and an alloy including stainless steel and 5-60% by weight of one or more radiopaque elements (e.g., Pt, Ir, Au, W) (PERSS???) as described in US-2003-0018380-A1, US-2002-0144757-A1, and US-2003-0077200-A1), Nitinol (a nickel-titanium alloy), Elgiloy, L605 alloys, MP35N, titanium, tita
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