About: http://webisa.webdatacommons.org/100826348

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	While reference has been made to perforated cores, it is also possible to use in the practice of this invention non-perforated cores or porous cores made from a material such as porous ceramic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es