About: http://webisa.webdatacommons.org/163548345

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	One of the two pieces is a rotatable covering disc having a small triangular opening and a pin protruding downward from a central position on its bottom side.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com