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Periscope - Wikipedia
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Today's Document — Sarah P. Mather's Submarine Telescope, 07/05/1864 ...
Submarines suddenly look dated - e-telescope online magazine
New US, British Navy Submarines Have New Kind of Periscope
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The eyes of a submarine
How Does a Submarine See Above Water? | Wonderopolis
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Submarine Telescope patent from 1864 - Blueprint Digital Art by Aged Pixel - Fine Art America
