PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • in a uniform manner and at the same time effects the release of gas bubbles, dirt, rust, scale and other particles from the casing surface so as to enable the formation of a highly effective sealing bond between the cement column and the casing wall.
http://www.w3.org/ns/prov#wasQuotedFrom
  • patents.com