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<http://webisa.webdatacommons.org/161577393>	<http://www.w3.org/ns/prov#value>	"tantially horizontal surface such as a floor and walked over, or of being mounted on a non-horizontal...http://www.google.com.au/patents/US7145469?utm_source=gb-gplus-sharePatent US7145469 - Display system for use on horizontal or non-horizontal surfacesAdvanced Patent SearchPublication numberUS7145469 B2Publication typeGrantApplication numberUS 11/002,276Publication date5 Dec 2006Filing date3 Dec" .
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