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<http://webisa.webdatacommons.org/225187051>	<http://www.w3.org/ns/prov#value>	"The system of claim 11, said converting means including a switch that causes the radiation beam from the source to be transmitted alternately along the two paths towards the sample surface." .
<http://webisa.webdatacommons.org/prov/114553259>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/225187051> .
<http://webisa.webdatacommons.org/225187051>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .