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
North Eastern Electric Supply Company World at the time. After the First World War it took over the Cleveland and Durham Electric Power Company, the Northern Counties Electricity Supply Company, Durham County Electric Power Company, and Tees Power Station Company. It also took over the assets of the Durham Collieries Electric Power Company and the Hexham & District Supply Company following their liquidations. NESCo opened North Tees Power Station in 1921 and Dunston B Power Station in 1933. In 1927, the company moved into their new headquarters at Carliol House in Newcastle's city centre. The building was designed by Robert Burns Dick. Carliol House Ltd.