About: http://webisa.webdatacommons.org/179927896

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	Assuming that the line connecting between a disk center 1193 and the mark is a reference line 1194, a two-dimensional polar coordinate system on a magnetic disk is set using the disk center and the reference line.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com