About: http://webisa.webdatacommons.org/171770163

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	The apertures may also have circular, rectangular, oval, or other geometrical cross sections.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com