About: http://webisa.webdatacommons.org/86041432

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	This invention relates generaly to surveying of boreholes, and more particularly concerns methods and apparatus which enable significant reductions in well survey time; also it relates to land navigation apparatus and methods.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com