About: http://webisa.webdatacommons.org/332966114

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	Perforated sheet metal, wire mesh, wire cloth, or other suitable material having the necessary hole-to-solid surface ratio may be used.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com