About: http://webisa.webdatacommons.org/208832787

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 stiffening system 30 may be made from any suitable material, such as plastic, wood or metal and may provide a tube-like or frame-like structure to reinforce the core mattress 20.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com