| http://www.w3.org/ns/prov#value | - In general, materials such as Elgiloy??? which will not exceed their elastic limit as easily as stainless steel are preferable in embodiments which are required to undergo particularly extreme curvature in use. [0047] Preferably, an outer tubular sleeve is provided for surrounding the tubular body 12 at least throughout the length of spring coil 14.
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