<http://webisa.webdatacommons.org/45979404>	<http://www.w3.org/ns/prov#value>	"Many such systems are known to those skilled in the art including systems wherein floor mounted switches are operated by a magnet supported by a tow line vehicle." .
<http://webisa.webdatacommons.org/45979404>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/402981513>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/45979404> .
<http://webisa.webdatacommons.org/45979404>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .