1845, Michael Faraday, working in his laboratory at the Royal Institution, hung a piece of heavy glass between the poles of an electro-magnet and observed that the glass aligned itself across the lines of force of the magnet.
1846, the first U.S. patent for an artificial leg was granted to Benjamin F. Palmer of Meredith, New Hampshire (No. 4,834).
1873, the first U.S. patent was issued for a meat-slicing machine to Anthony Iske of Lancaster, Pennsylvania (No. 144,206).
1873, the first U.S. patent for a gold crown was issued: to Dr. John B. Beers of San Francisco, California on "artificial crowns for teeth" (No. 144,182).
1879, James Jacob Ritty (1837-1918) with help from his brother John invented the first cash register, intended to combat stealing by bartenders in the Pony House Restaurant, his Dayton, Ohio saloon.
1879, African-American Thomas Elkins patented a refrigerating apparatus (No. 221,222) designed for chilling or cooling food, or even, according to the patent, human corpses.
1939, the first air-conditioned automobile was exhibited by its manufacturer, Packard Motor Co. of Detroit Michigan.
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