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	Browse Inventions: Radio High-Frequency Alternator Inventor Ernst Alexanderson was the General Electric Company engineer . . . . Radio Method of Receiving High-Frequency Oscillations His crowning achievement (1933) was the invention of wide-band frequen . . . . Radio Space Telegraphy In the early 1900s, the great requirement for further development of r . . . . Radio Apparatus for Signaling by Electromagnetic Waves Reginald Fessenden is known for discovering amplitude modulation (AM) . . . . Radio Transmitting Electrical Signals In 1895 Italian inventor Guglielmo Marconi built the equipment and tra . . . . Radio Distance and Direction Indicator Radio Distance and Direction Indicator Luis Walter Alvarez invented a radio distance and direction indicator. . . . . Radio Frequency Mass Spectrometer Radio Frequency Mass Spectrometer Willard Harrison Bennett pioneered the field of plasma physics and inv . . . . Railway Telegraphy Random Access Memory Multicoordinate Digital Information Storage Device Jay W. Forrester was a pioneer in early digital computer development a . . . . Respiration Apparatus Respirator / Ventilator Fluid Control Device; Respirator; Pediatric Ventilator On television every week in the 1960s, Dr. Kildare committed himself t . . . . Retractable Landing Gear; Folding Wing Retractable Landing Gear for Airplanes; Folding Wing After serving as a mechanic, flight instructor, test pilot and enginee . . . . Revolver with Interchangeable Parts Revolving Door Rigid airship Rotor Control Mechanism for Helicopter Rotor Control Mechanism for Aircraft of Rotary Wing Type In 1940 Kaman began working as an aerodynamicist with renowned helicop . . . .