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New US, British Navy Submarines Have New Kind of Periscope
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Periscope: What is Periscope, Applications and Areas of Periscope
USS Pampanito - Periscopes
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Telescoping Periscope - TryEngineering.org Powered by IEEE
How far can a submarine periscope see when it's in the middle of an ocean? - Quora
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What is the name of the telescope used on a submarine? - Quora
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Periscope manufacturer for submarines | Nedinsco
