Machine Gun : (multibarrel) Richard J. Gatling, U.S.A., 1862; (single barrel, belt-fed) Hiram S. Maxim, Anglo-American, 1884.
Magnet, Earth is : William Gilbert, England, 1600.
Magnetic Resonance Imaging (MRI) : Raymond Damadian, Paul Lauterbur, U.S.A., early 1970s.
Matchstick/box : (phosphorus) Francois Derosne, France, 1816; (friction) Charles Sauria, France, 1831; (safety) J. E. Lundstrom, Sweden, 1855.
Metric System : Revolutionary government of France, 1790-1801.
Microphone : Charles Wheatstone, England, 1827.
Microscope : (compound) Zacharias Janssen, The Netherlands, 1590; (electron) Vladimir Zworykin et al., U.S.A., Canada, Germany, 1932-1939.
Microwave Oven : Percy Spencer, U.S.A., 1947.
Missile, Guided : Wernher von Braun, Germany, 1942.
Motion, Laws of : Isaac Newton, England, 1687.
Motion Pictures : Thomas A. Edison, U.S.A., 1893.
Motion Pictures, Sound : Product of various inventions. First picture with synchronized musical score : Don Juan, 1926; with spoken diologue : The Jazz Singer, 1927; both Warner Bros.
Motor, Electric : Michael Faraday, England, 1822; (alternating-current) Nikola Tesla, U.S.A., 1892.
Motorcycle : (motor tricycle) Edward Butler, England, 1884; (gasoline-engine motorcycle) Gottlieb Daimler, Germany, 1885.
Moving Assembly Line : Henry Ford, U.S.A., 1913.
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