| http://www.w3.org/ns/prov#value | - The two pieces may be formed of plastic or other appropriate material, and each piece may be shaped to define an inner surface of cellular configuration so that when the two pieces are fitted together...http://www.google.com/patents/US4182520?utm_source=gb-gplus-sharePatent US4182520 - Skateboard structureAdvanced Patent SearchPublication numberUS4182520 APublication typeGrantApplication numberUS
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