About: http://webisa.webdatacommons.org/51618282

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 number that follows the command is a label or marker used to name that particular pattern so it may be referenced later with the command M51.
http://www.w3.org/ns/prov#wasQuotedFrom	excellon.com