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ACADEMY 18153 Da Vinci Series Arch Bridge Mechanical Model Kit M&StL woodchips and limestoneACADEMY 18153 Da Vinci Series Arch Bridge Mechanical Model Kit Leonardo was revered for his technological ingenuity. He conceptualized, among many others, a helicopter, a tank, a paddleboat, a self propelling cart, concentrated solar power, a calculator, the double hull and outlined a rudimentary theory of plate tectonics. Relatively few of his designs were constructed or were even feasible during his lifetime, but some of his smaller inventions, such