(inv. c. 1989), U.S. – fused deposition modeling Nicolas-Joseph Cugnot (1725–1804), France – first steam-powered road vehicle William Cullen (1710–1790), UK – first artificial refrigerator Jan Czochralski (1885–1953), Poland / Germany – Czochralski process (crystal growth) D Nils Gustaf Dalén (1869–1937), Sweden – AGA cooker, Dalén light, Agamassan, Sun valve for lighthouses and buoys John Frederic Daniell (1790–1845), UK – Daniell cell Corradino D'Ascanio (1891–1981), Italy – Vespa scooter Leonardo da Vinci (1452–1519), Italy – helicopter, tanks, and parachutes for safety Raymond Damadian (1936–2022), Armenia/U.S. - Magnetic resonance imaging (MRI) Robert Davidson (1804-1894), Scotland - electric locomotive Jacob Davis (1868–1908), U.S. – Riveted jeans Humphry Davy (1778–1829), UK – Davy miners lamp Joseph Day (1855–1946), UK – the crankcase-compression two-stroke engine Lee de Forest (1873–1961), U.S. – Phonofilm, triode Fe del Mundo (1911–2011), Philippines – non-electric incubator Yuri Nikolaevich Denisyuk (1927–2006), Russia – 3D holography Robert H. Dennard (born 1932), U.S. – Dynamic random-access memory (DRAM) Miksa Déri (1854–1938), Hungary – co-inventor of an improved closed-core transformer Robert DeStefano (born 1962), U.S. - exercise equipment James Dewar (1842–1923), UK – Thermos flask Aleksandr Dianin (1851–1918), Russia – Bisphenol A, Dianin's compound William Kennedy Laurie Dickson (1860–1935), UK – motion picture camera Philip Diehl (1847–1913), U.S. – Ceiling fan Rudolf Diesel (1858–1913), Germany – Diesel engine William H. Dobelle (1943–2004), U.S. – Dobelle Eye Johann Wolfgang Döbereiner (1780–1849), Germany – Döbereiner's lamp (chemistry) Toshitada Doi (born 1943), Japan, together with Joop Sinjou, Netherlands – Compact disc Ray Dolby (1933–2013), U.S. – Dolby noise-reduction system Mikhail Dolivo-Dobrovolsky (1862–1919), Poland/Russia – three-phase electric power Marion O'Brien Donovan (1917–1998), U.S. – Waterproof diaper Hub van Doorne (1900–1979), Netherlands, Variomatic continuously variable transmission John Thompson Dorrance (1873–1930), U.S. – Condensed soup Amanda Minnie Douglas (1831–1916), writer and inventor (portable folding mosquito net frame) Charles Dow (1851–1902), U.S. – Dow Jones Industrial Average Mulalo Doyoyo (born 1970), South Africa/U.S. – Cenocell – cementless concrete Anastase Dragomir (1896–1966), Romania – Ejection seat Karl Drais (1785–1851), Germany – dandy horse, Draisine Richard Drew (1899–1980), U.S. – Masking tape John Boyd Dunlop (1840–1921), UK – first practical pneumatic tyre Cyril Duquet (1841–1922), Canada – Telephone handset Alexey Dushkin (1904–1977), Russia – deep column station James Dyson (born 1947), UK – Dual Cyclone bagless vacuum cleaner, incorporating the principles of cyclonic separation. E George Eastman (1854–1932), U.S. – roll film J. Presper Eckert (1919–1995), U.S. – ENIAC – the first