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  2. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    In water-powered mills, a sluice gate opens a channel, starts the water flowing, and a water wheel turning. In 1787, American inventor Oliver Evans revolutionized this labor-intensive process by building the first fully automatic mill using bucket elevators, screw conveyors, and the hopper boy to spread, cool, and dry the meal between grinding ...