About: http://webisa.webdatacommons.org/326779770

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	When a defect, void, or other anomaly in the pipe was indicated by sensing an interruption of a smooth longitudinal magnetic flux, then such an anomaly was recorded on a graph as a function of time or distance.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com