About: http://webisa.webdatacommons.org/289777940

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	Most such support structures are made of aluminum, or other light-weight material, to insure portability and ease of handling by an impaired or elderly person.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com