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The IBM Portable PC 5100 was invented by IBM in 1975. It was more self-reliant and able to run without a heavy processor.
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The osborne 1 was invented by Adam Osborne in 1981. It is often considered by historians to be the first laptop.
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The Grid Compass 1100 was invented by Bill Moggride in 1982. It was the most luxurious of laptops only used by high flyers and the public sector.
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The Gavilan SC was invented by Manny Fernandez,s in 1983. It can be said to be the first fully functional laptop.