About: http://webisa.webdatacommons.org/12203648

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	In an angle-measuring version of the invention, marking element 60 makes a mark such as a line, indicative of an angle measured about an axis 160 from a reference direction at end 120 of the measuring element 40.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com