About: http://webisa.webdatacommons.org/8662722

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 improvement of claim 2 wherein said means for refracting is a wedge disposed between said light sources and said measurement vessel.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com