<http://webisa.webdatacommons.org/313971741>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com.au> .
<http://webisa.webdatacommons.org/prov/50201151>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/313971741> .
<http://webisa.webdatacommons.org/313971741>	<http://www.w3.org/ns/prov#value>	"In the preferred embodiment the light shifting units 50, 52 are birefringent crystals of doubly refracting material, such as sodium, calcium, salt, or more commonly available calcite." .
<http://webisa.webdatacommons.org/313971741>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .