About: http://webisa.webdatacommons.org/402322641

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 a prototype, the base 15 is made of fibrous pressed board, but metal, plastics, wood and other materials will serve as well.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com