Between 1950 and 1982, Sony successfully built twelve different new-market disruptive growth businesses. These included the original battery-powered pocket transistor radio, launched in 1955, and the first portable solid-state black-and-white television, in 1959. They also included videocassette players; portable video recorders; the now-ubiquitous Walkman, introduced in 1979; and 3.5-inch floppy disk drives, launched in 1981.
