About: http://webisa.webdatacommons.org/416001333

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	Each key has a raised line at the edge which helps define its function such as up, down, left, or right.
http://www.w3.org/ns/prov#wasQuotedFrom	nfb.org