 In March 1958, Remington Rand St. Paul Univac-division of Sperry Rand Corporation, had built and delivered a transistorized 30-bit AN/USQ-17 computer, for the United States Navy Tactical Data System (NTDS).It was designed by Univac's St. Paul engineer Seymour Cray starting on January 1957, and used the Philco's high-frequency surface-barrier transistors in its computer's circuitry design.Philco's high-frequency surface-barrier transistors was also used in the circuitry design of the first transistorized supercomputer.