 Philco's Transac models S-1000 scientific computer and S-2000 electronic data processing computer were the world's first commercially produced large-scale all-transistor computers, which were introduced in 1957 and used these high-frequency surface-barrier transistors in its circuitry designs.In June 1957, the Burroughs Corporation transistorized ground guidance computer (AN/GSQ-33) was built and installed at Cape Canaveral missile test range, for the United States Air Force's Atlas intercontinental ballistic missile defense system (ICBM).This transistorized ground guidance Atlas computer system was designed by Burroughs engineer Issac Auerbach and used Philco's high-frequency surface-barrier transistors in its circuitry design.