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- 13:01, 21 April 2009 AzraelBrown talk contribs uploaded File:Periscope View, Book Of Knowledge, 1900s.jpg (Viewpoint of a WWI-era submarine; according to the associated article from The Book Of Knowledge, this worked like a ''camera obscura'', projecting a panoramic, circular view of the submarine's surroundings onto a white table-top surface. 1910s.)