About: http://webisa.webdatacommons.org/228614763

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	It will be obvious, however, that the form of notch 41 is not critical, and other shapes, e.g., rectangular or circular, of uniform or varying depth can also be used.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com