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The first laptop was invented in 1979 by British Designer Bill Moggridge. GRiD Systems Corporation helped improve his design. GRiD made the product with a fold-down display that covered the keyboard. It was called the GriD Compass. In 1982, Grid Systems began to make many GriD Compass laptops. They were mostly sold to the US Military and NASA. GRiD's computer was one fifth the weight of any other computer used at that time. NASA used the laptop in its Space Shuttle program, in the 1980s. The Grid Compass required mains power.