About: http://webisa.webdatacommons.org/192998328

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	This system is especially practical in situations where the ground 430 is uneven, and therefore, each pier 260 may have a different length to achieve a horizontal flooring surface.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com