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RE: NATURE INSPIRED INVENTIONS --- Sonar System; and I measured the depth of the sea. It was on my Mark Twain!

in #steemstem7 years ago

Well, if you have any references to submarines transporting troops before WWII (not spies), then I'll be happy to learn :) And BTW, first successful submarine attack took place during American Civil War, so they were invented a bit earlier then WWI.

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You have a valid point there.. I stand corrected.. Am glad you shared your knowledge with me.