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Gutenberg invented printing. About fifteen years before the invention of printing, he marketed a very early periscope. I think the question confuses these two facts.
Gutenberg marketed a periscope in the 1430's, so pilgrims could see over the heads of people in the crowd. He actually may have invented it. I see no record of what it was called at the time, but the scientific naming conventions used in modern English would certainly give it the name periscope.
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