About: http://webisa.webdatacommons.org/343472575

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	Another problem is that such screens can only be used on relatively soft surfaces such as sand into which the stakes can be driven to anchor the screen.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com