About: http://webisa.webdatacommons.org/412249715

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	The very nature of the use of such an implement is such that considerable shock is periodically applied to each spring tooth as, for example, when striking a hard object such as a rock.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com