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<http://webisa.webdatacommons.org/prov/448893642>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/305189886> .
<http://webisa.webdatacommons.org/305189886>	<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" .
<http://webisa.webdatacommons.org/305189886>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .