About: http://webisa.webdatacommons.org/268118376

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	It may be so constructed that the amount of the released gas from the release ports is adjustable with a check valve in response to the conditions such as the thickness of the work or the material to be used as the work.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es