In 1683, the Dutch scientist Antonie van Leeuwenhoek wrote to the Royal Society reporting his discovery of microscopic living animalcules (live bacteria).
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In 1844, the first U.S. patent was issued for a printing press with different colours of ink applied in one impression (No. 3,744). The inventor, Thomas F. Adams of Philadelphia, Pa., called it "polychrome printing."
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In 1872, the first U.S. patent for an automatic sprinkler system was issued to Phillip W. Pratt, of Abington, Mass., titled “Improvement in Fire-Extinguishers” (No. 131,370).
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