About: http://webisa.webdatacommons.org/162042658

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	As this happens, air is displaced and it may be necessary to provide means such as a bleed tube by which the air can vent from the blasthole.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com