computer was later commercially named the Philco Transac S-1000. The SOLO transistorized large scale scientific computer was finally built and delivered to the National Security Agency in November 1957. Philco also entered into a contract with the U.S. Navy's David Taylor Basin Research Division in 1955, to build a larger scale fully transistorized computer using its surface-barrier transistor technology, which was named the CPXQ model and later became the Philco Transac S-2000. Philco had developed and produced a miniature transistorized computer brain for the Navy's jet fighter planes in 1955, which was called the "Transac" (C-1000, C-1100) and which stood for "Transistor Automatic Computer". It used Philco's high-frequency surface-barriers transistors in its circuitry design. Chrysler and Philco announced that they had developed and produced the world's first all-transistor car radio and it was announced in the April 28, 1955, edition of the Wall Street Journal. Chrysler made the all-transistor car radio, Mopar model 914HR, available in Fall 1955 for its new line of 1956 Chrysler and Imperial cars, as a $150 option ($ in dollars ). Philco's radio manufacturing plant in Sandusky, Ohio, had produced the all-transistor car radio unit for the Chrysler Corporation, which also used Philco's surface-barrier transistors in its circuitry design. In 1955, Philco developed and produced the world's first all-transistor phonograph models TPA-1 and TPA-2. This was originally announced in the June 28, 1955, edition of the Wall Street Journal. Philco had begun selling these all-transistor phonographs in the fall of 1955 for $59.95. The October 1955 issue of Radio & Television News magazine (page 41) printed a full-page, detailed article, on Philco's new consumer product all-transistor phonograph. The Philco all-transistor portable phonograph TPA-1 and TPA-2 models played only 45rpm records and used four 1.5v "D" batteries for its power supply. "TPA" stands for "Transistor Phonograph Amplifier". Its circuitry used three Philco germanium PNP alloy-fused junction audio frequency transistors. After the 1956 season ended, Philco decided to discontinue the all-transistor portable 45rpm phonograph models, for transistors were too expensive compared to vacuum tubes. The Philco Transac models S-1000 scientific computer and S-2000 electronic data processing computer, were the first commercially produced large-scale all transistor computers, which were introduced in 1957. It used discrete surface barrier transistors instead of vacuum tubes (as the integrated circuit had not yet been invented). It also used a fast adder, originally invented by Bruce Gilchrist, James H. Pomerene and Y.K. Wong