Stanley brothers, U.S. inventors and twins; Francis Edgar Stanley (1849–1918) and Freeland Oscar Stanley (1849–1940). Their first company manufactured their inventions related to the field of photography and was eventually sold to Eastman Kodak Company (1904). Their experimentation with steam engines led to building the Stanley Steamer (1897). Their Stanley Motor Carriage Company (1901) produced a steam engine that traveled 128 mph (206 km), breaking the existing speed record (1906). With the manufacture of gasoline-engine automobiles, Stanley Steamers became far less popular; they were discontinued in 1924.