About: http://webisa.webdatacommons.org/309414220

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	The detection unit may comprise a magnetizing head, such as a recording head or bar magnet, and a sensor or read head that reads the remanent magnetization or another device that senses magnetic permeability.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com