<http://webisa.webdatacommons.org/52538416>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .
<http://webisa.webdatacommons.org/52538416>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/401173394>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/52538416> .
<http://webisa.webdatacommons.org/52538416>	<http://www.w3.org/ns/prov#value>	"The soundfield is measured in each ear by various types of microphones." .