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<http://webisa.webdatacommons.org/282677979>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/211724363>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/282677979> .
<http://webisa.webdatacommons.org/282677979>	<http://www.w3.org/ns/prov#value>	"Each of the light beams begins with a light emitting source such as a LED, and a light responsive device such as a phototransistor is located at the other end of the beam." .