About: http://webisa.webdatacommons.org/418311522

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	Protan08-07-2007, 09:02 AMSo I have heard that on Co2 tanks (Atleast here in Canada) there is a stamp that tells when its expired.
http://www.w3.org/ns/prov#wasQuotedFrom	spyder.tv