About: http://webisa.webdatacommons.org/425547495

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	It should also be noted that the brackets are generally made of a rigid material, such as sheet metal or steel.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com