<http://webisa.webdatacommons.org/52136644>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/52136644>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/250152621>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/52136644> .
<http://webisa.webdatacommons.org/52136644>	<http://www.w3.org/ns/prov#value>	"Thus, there has been proposed apparatus, such as illustrated in FIG. 2, which, in order to eliminate this disadvantage, dispenses with the half-mirror 24." .