About: http://webisa.webdatacommons.org/150575239

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	from sheet metal such as steel and duralumin or fiberglass or from an arched strong framework and a cloth covering and has a calotte-shaped cross-section and composed of opposite side
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com