<http://webisa.webdatacommons.org/422968135>	<http://www.w3.org/ns/prov#value>	"The apparatus is useful in a method of relieving eyestrain for an operator of a video display terminal having a display screen and an operator control station such as a keyboard." .
<http://webisa.webdatacommons.org/prov/486087965>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/422968135> .
<http://webisa.webdatacommons.org/422968135>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/422968135>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .