About: http://webisa.webdatacommons.org/104463344

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	Each upright member 20 is preferably formed from a strong and durable material, such as sheet steel, aluminum or a plastic such as polyvinyl chloride.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com