About: http://webisa.webdatacommons.org/416036071

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. 1a is a partially cross-sectional cut-away side view of a Horizontal Directional Drilling (HDD) system with a dual member drill string built in accordance with the present invention.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com