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Periscope - Wikipedia
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Periscope - Wikipedia
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Submarine Periscope Manual - Chapter 1
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Periscope - Wikipedia
.jpg "What is a Periscope?")
What is a Periscope?
/GettyImages-653781728-58efddf05f9b582c4d5d6a49.jpg "Periscope Inventors Sir Howard Grubb and Simon Lake")