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<http://webisa.webdatacommons.org/380933629>	<http://www.w3.org/ns/prov#value>	"Patent US3940204 - Optical display systems utilizing holographic lenses - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsThis invention is applicable to display systems, such as in a helmet mounted display or a head-up display, utilizing a holographic lens operating at a relatively large off-axis angle in order to perform the dual function" .
<http://webisa.webdatacommons.org/380933629>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .