About: http://webisa.webdatacommons.org/402619229

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	In the past, such structures have typically been formed from materials such as wood, particle board, and high density plastics.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com