| http://www.w3.org/ns/prov#value | - The optimal choice of particle sizes, particle shape, particle composition and installation in multiple layers or courses is a feature of the present invention. [0005] U.S. Pat. No. 4,337,283 to Haas, Jr. discloses a homogeneous infill mixture to imitate soil that is made of fine hard sand particles mixed with 25% to 95% by volume resilient particles to provide an improved resilient and less abras
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