About: http://webisa.webdatacommons.org/29693282

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	On the circular left edge 12L of the center plate 12, there are four locating notches or locating detents 12A-12D and there are an additional four locating notches or locating detents 12E-12H in the right edge 12R of the center plate 12.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk