About: http://webisa.webdatacommons.org/276887768

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	The necessary rigidity is provided by a stiffening bar 28 which may be formed of a material such as wood or plastic having a thickness much greater than the thickness of the plastic material 26.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com