Air Brake : George Westinghouse, U.S.A. 1911.
Air Conditioning : Willis Carrier, U.S.A. 1911.
Airplane : engine-powered, Wilbur & Orville Wright, U.S.A., 1903.
Airship : Henri Giffard, France, 1852; Ferdinand von Zeppelin, Germany, 1900.
Antibiotics : Louis Pasteur, Jules-Francois Joubert, France, 1887; (discovery of penicillin) Alexander Fleming, Scotland, 1928.
Antiseptic : (surgery) Joseph Lister, England, 1867.
Aspirin : Dr. Felix Hoffman, Germany, 1899.
Atom : (nuclear model of) Ernest Rutherford, England, 1911.
Atomic Structure : Ernest Rutherford, England, 1911; Niels Bohr, Denmark, 1913.
Automated Teller Machine (ATM) : Don Wetzel, U.S.A., 1968.
Automobile : (first with internal combustion engine, 250 rmp) Karl Benz, Germany, 1885; (first with practical highspeed internal combustion engine, 900 rpm) Gottlieb Daimler, Germany, 1885; (first true automobile, not
carriage with motor) Rene Panhard, Emile Lavassor, France, 1891; (carburetor, spray) Charles E. Duryea, U.S.A., 1892.
Auilot : (for aircraft) Elmer A. Sperry, U.S.A., c.1910, first successful test, 1912, in a Curtiss flying boat.
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