About: http://webisa.webdatacommons.org/147548729

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 bars of the frame are preferably made of coiled aluminum, however, any light weight but rigid material, such as extruded aluminum, poly-propylene laminate composite or the steel iron can also be used.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com