| http://www.w3.org/ns/prov#value | - The structure of claim 1 wherein the filling materials are selected from the group consisting essentially of hardener filler materials include polymers, such as phenolics, urea-formaldehyde, styrene, styrene copolymers, acrylics, urethanes, vinyl s, foams, aerated cement, concrete, wood flour mixes, synthetic or natural rubber, latex, molten rubber, molten sulphur, mixture of the combination of ru
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