About: http://webisa.webdatacommons.org/451265087

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	In one embodiment, a working tool that is moved such as along a reciprocating path is provided with one or more apertures corresponding to different positions of the tool during its stroke.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com