About: http://webisa.webdatacommons.org/428086358

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	A review of the variable density recording techniques will show that a sign wave or other signal generated results from a variation in the intensity of given marks on the full width record medium.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com