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Dates for inventions are often controversial. Inventions are often invented by several inventors around the same time, or may be invented in an impractical form many years before another inventor improves the invention into a practical form. Where there is ambiguity, the date of the first working version of the invention is used here.
1910: Thermojet engine: Henri Coandă
1911: Gyrocompass: Elmer A. Sperry
1911: Automobile self starter (perfected): Charles F. Kettering
1911: Air conditioner: Willis Haviland Carrier
1911: Cellophane: Jacques Brandenburger
1911: Hydroplane: Glenn Curtiss
1912: Ecstasy: Merck
1912: Photography ;Lapse-time camera for use with plants:Arthur C. Pillsbury
1912: Regenerative radio circuit: Edwin H. Armstrong
1913: Cracking process for Gasoline: William M. Burten
1913: Crossword: Arthur Wynne
1913: Double acting wrench: Robert Owen
1913: Gyroscope stabilizer: Elmer A. Sperry
1913: Radio receiver, cascade tuning: Ernst Alexanderson
1913: Radio receiver, heterodyne: Reginald Fessenden
1913: Stainless steel: Harry Brearley
1913: X-Ray (improved): William D. Coolidge
1914: Radio transmitter triode mod.: Ernst Alexanderson
1914: Liquid fuel rocket: Robert Goddard
1914: Tank, military: Ernest Dunlop Swinton
1915: Tungsten Filament: Irving Langmuir
1915: Searchlight arc: Elmer A. Sperry
1915: Radio tube oscillator: Lee DeForest
1915: Pyrex: Corning Inc.
1916: Browning Gun: John Browning
1916: Thompson submachine gun: John T. Thompson
1916: Incandescent gas lamp: Irving Langmuir
1917: Sonar echolocation: Paul Langevin
1917: Cruise missile: Charles Kettering
1918: Superheterodyne receiver: Edwin H. Armstrong
1918: Interrupter gear: Anton Fokker
1918: Radio crystal oscillator: A.M. Nicolson
1918: Pop-up toaster: Charles Strite
1919: Flip-flop circuit: William Eccles and F. W. Jordan
1919: Theremin: Leon Theremin
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