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Leonardo da vinci drew a "tank" which he claimed "to hurl small stones like a storm with the smoke"
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Made a caterpillar track
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the french captian Levavasseur proposed the levavasseur project, a canon autopropulsevr (self-propelled cannon)
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43mm main guns were manufactured in the machines.
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Russian army adopted the 2S25 (also known as the sprut-SD) still used today.