About: http://webisa.webdatacommons.org/255293489

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	Retaining bars 20, 21 are preferably formed of lightweight, sturdy material, such as aluminum or steel.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com