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<http://webisa.webdatacommons.org/295030123>	<http://www.w3.org/ns/prov#value>	"Brevet US3940204 - Optical display systems utilizing holographic lenses - Google???BrevetsRecherche Images Maps Play YouTube Actualit???s Gmail Drive Plus ??Connexion Recherche avanc???e dans les brevets BrevetsThis 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 ord" .
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