About: http://webisa.webdatacommons.org/163046749

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	If metal, the hollow sphere 13 may be manufactured by forming two halves of a sphere by hot forming or cold forming which are then joined together by welding or other means sufficient to securely join the halves of the sphere together.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es