About: http://webisa.webdatacommons.org/63703714

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	Heretofore, the penetration depth of elongate medical devices, such as catheters and probes, has usually been monitored visually by the physician observing scale markings which have been placed on the side of the device.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com