<http://webisa.webdatacommons.org/418799209>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .
<http://webisa.webdatacommons.org/prov/241151934>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/418799209> .
<http://webisa.webdatacommons.org/418799209>	<http://www.w3.org/ns/prov#value>	"FIG. 2 is an illustration of the relative voltage levels of the output signals O1, O2, O3 and O4 and the locations of the sonic image 2 in which the voltage levels are indicated by hatched area." .
<http://webisa.webdatacommons.org/418799209>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .