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	Browse Inventions by decade patented: 1930 - 1939 pH Meter Arnold O. Beckman Magnetic Recording S. Joseph Begun Negative Feedback Amplifier Harold Stephen Black Peach and Fruit Luther Burbank Synthetic Rubber Wallace Hume Carothers Cathode-Ray Tube Philo Taylor Farnsworth Fluorescent Lamp Edmund Germer Catalytic Cracking Eugene Houdry Cyclotron Ernest Orlando Lawrence Car Radio William P. Lear Synthetic Rubber Julius Nieuwland Polyvinyl Chloride (PVC) Waldo L. Semon Pentothal / Anesthesia Donalee L. Tabern Pentothal / Anesthesia Ernest H. Volwiler Vitamins Robert R. Williams Cathode-Ray Tube Vladimir Kosma Zworykin Retractable Landing Gear; Folding Wing Leroy Grumman Altimeter Paul Kollsman Link Trainer / Simulator Edwin A. Link Turbojet Theodore von Kármán Differential Analyzer Vannevar Bush Sterilizing Foodstuffs Food Preservatives Lloyd Hall Color Photography Leopold Mannes Frozen Foods Clarence Birdseye Color Photography Leopold Godowsky, Jr. Concentric Conduction System Herman A. Affel Coaxial Cable Lloyd Espenschied Fiberglass Dale Kleist Fiberglass Russell Games Slayter Fiberglass John Thomas Adhesive Tape Richard Gurley Drew Respiration Apparatus Philip Drinker Automobiles Louis Renault