of the Institute for Advanced Study. It incorporated a speed up technique for asynchronous adders reducing the time for additive carry-overs to propagate. In 1959, Philco developed and produced the world's first battery-powered portable transistorized TV. This TV model was called the "Safari" and it contained 21 transistors inside. Philco had developed the VHF micro-alloy diffused-base (MADT) transistors and used them in the Safari portable TV. The retail selling price was $250.00 ($ in dollars ) plus the cost of the rechargeable battery, which was $5.25 extra ($ in dollars ). In 1962, the Philco 2000 Model 212 computer was chosen for use in the North American Aerospace Defense Command's famous Cheyenne Mountain Complex. Three of the machines were installed that year and ran until 1980. The machines were also used by research labs at Westinghouse Electric and General Electric. Space systems In 1960, the Courier 1B, built by Philco, became the world's first active repeater satellite. Courier 1B was built by the Western Development Labs (WDL) division of Philco, previously known as "Army Fort Monmouth Laboratories" (Fort Monmouth). In 1960, NASA contracted with Philco to build the worldwide tracking station network for Project Mercury, and all subsequent man-in-space projects until the ground station network was replaced by the TDRS communication satellites in the 1990s. Philco's Western Development Labs ultimately became Space Systems/Loral, which continues to manufacture spacecraft. In later years, the company produced automotive electronic controls, aerospace tracking systems, and artificial satellites. In 1963, Philco was also responsible for the design, manufacturing, installation, and service of all the consoles used in both Mission Operations Control Rooms (a.k.a. Mission Control) at Building 30 of NASA's Lyndon B. Johnson Space Center in Houston, Texas. Philco technical representatives worked with NASA staff to design and integrate the consoles with NASA hardware and systems. The consoles were used for the Gemini, Apollo, Skylab, and Space Shuttle missions until 1998. The Philco-designed and installed consoles in Mission Control 2 at the Johnson Space Center have been preserved and will be restored to their Apollo-era configuration for historical purposes. The control room is now listed in the National Register of Historic Places as the "Apollo Mission Control Center". Water purification systems In 1971, Philco-Ford began to sell reverse osmosis-based water purification systems that used tube-shaped membranes developed by the company to filter and desalinate raw polluted water for municipal utilities and manufacturing. Demise On December