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
Ultra Electronics Ultra Electronics Ultra Electronics Holdings () is a British company serving the defence, security, transport and energy industries. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index. The Company was started by Teddy Rosen in 1920 as "Edward E. Rosen & Co." manufacturing high quality headphones. In 1923 the company moved to new premises at Harrow Road, London and in 1925 a new company "Ultra Electric Ltd." was formed. Ultra introduced its first mains powered wireless set in 1931. After further expansion the company moved to larger premises at Erskine Road, Chalk