Calculator This led the way to the first credit-card-sized calculators, such as the Casio "Mini Card LC-78" of 1978, which could run for months of normal use on button cells. There were also improvements to the electronics inside the calculators. All of the logic functions of a calculator had been squeezed into the first "calculator on a chip" integrated circuits (ICs) in 1971, but this was leading edge technology of the time and yields were low and costs were high. Many calculators continued to use two or more ICs, especially the scientific and the programmable ones, into the late 1970s. The
Braun (company) producing film slide projectors, a mainstay of its business for the next forty years. By 1956, Braun was marketing the first fully automatic tray film slide projector, the PA 1. Braun AG slide projectors all utilized a linear or straight tray as opposed to a round-tray design, which allowed the projector to remain small and compact. The 1950s also marked the beginning of the product that Braun is most known for today: the electric shaver. The S 50 was the first electric shaver from Braun. The shaver was designed in 1938, but World War II delayed its introduction until 1951.