| http://www.w3.org/ns/prov#value | - The element material which makes up a major portion of the stringer length is selected to impart the required stiffness to the foam core material and may comprise a polymer, wound or woven fibers, resin-impregnated fibers, wood or other material; but prior art materials now used, such as thermoset resin-impregnated glass fiber and graphite fiber rods may be employed.
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