About: http://webisa.webdatacommons.org/116498751

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Numerous materials are contemplated by the inventor for the shaft 20, including acrylic plastic, metals, wood, and other materials that can be hollowed and that can also support the weight of a human.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com