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Re:Man Invents Glasses to Give Short People a Height Advantage by Someone on Monday June 24, 2019 @03:39PM (#20267591)
https://en.wikipedia.org/wiki/Periscope#Early_examples gives prior art:

”Johannes Gutenberg, known for his contribution to printing technology, marketed a kind of periscope in the 1430s to enable pilgrims to see over the heads of the crowd at the vigintennial religious festival[which?] at Aachen.”

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