1840s: Milk production in dairy farming is all done by hand.
1878: The first commercial milking machines are produced inAuburn, New York.
Today: Dairy farming is automated. Cows are kept in small enclosures that allow no room to move and seldom come into contact with humans.
1840s: The typewriter is a new invention. Patented in 1843, it uses the concept of the moving carriage to make letters strike evenly.
1878: The typewriter is greatly improved when the Remington Arms Company added a shift key that would allow the same document to include lower—and upper—case characters.
Today: Typewriters are practically obsolete. Word processing makes any desktop system capable of professional-quality graphics.
1840s: The first rail lines are just beginning to connect.....
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