What is periscope?
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.
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Asked 12/18/2011 6:08:38 PM
Updated 7/13/2018 12:40:31 PM
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Masamune [7/13/2018 12:40:29 PM], Confirmed by
Masamune [7/13/2018 12:40:31 PM]
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