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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.
1950: Credit card: Frank X. McNamara
1951: Combined oral contraceptive pill: Djerassi, Miramontes, and Rosenkranz
1951: Liquid Paper: Bette Nesmith Graham
1951: Nuclear power reactor: Walter Zinn
1952: Floppy disk: Yoshiro Nakamatsu
1952: Fusion bomb: Edward Teller and Stanislaw Ulam
1952: Hovercraft: Christopher Cockerell
1953: MASER: Charles Townes
1953: Medical ultrasonography
1954: Radar gun: Bryce K. Brown
1954: Transistor radio (dated from the from Regency TR1) (USA)
1954: Synthetic diamond: Tracy Hall
1954: Geodesic dome: Buckminster Fuller
1955: Velcro: George de Mestral
1955: Hair spray Helene Curtis
1955: Hard Drive: Reynold Johnson with IBM
1955: Video phone: Gregorio Y. Zara in the Philippines
1956: Digital clock
1956: Videocassette recorder: Ampex
1957: Jet Boat: William Hamilton
1957: Bubble Wrap: Alfred Fielding and Marc Chavannes
1958: Integrated circuit: Jack Kilby of Texas Instruments, Robert Noyce at Fairchild Semiconductor
1958: Communications satellite: Kenneth Masterman-Smith
1958: Implantable pacemaker: Rune Elmqvist
1959: Snowmobile: Joseph-Armand Bombardier
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