<http://webisa.webdatacommons.org/426839343>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .
<http://webisa.webdatacommons.org/426839343>	<http://www.w3.org/ns/prov#value>	"Optional but recommended are safeguard systems such as buried wires around the field, bumpers on the tractor, etc." .
<http://webisa.webdatacommons.org/prov/302901378>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/426839343> .
<http://webisa.webdatacommons.org/426839343>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .