About: http://webisa.webdatacommons.org/64721528

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	FIG. 2 is a side elevational view of the apparatus of the present invention, installed in a doorway of a building, and showing the laser leveling instrument positioned at an upper location and also a lower location;
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr