About: http://webisa.webdatacommons.org/399676985

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	FIG. 3B is a full side view of a penetration device of this invention which is also a fastener, in a vertical position wherein the fastener is of the metal piercing type and showing a spiral opening.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com