About: http://webisa.webdatacommons.org/242092220

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	Alternately, it can have one or more flat surfaces, as does the gain medium shown in U.S. Pat. No. 4,805,177, or it can have a square, rectangular, or other cross-sectional shape.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es