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The first laptop dates back to the 2nd century BC called an anti-colic machine or astrolabe.
The astrolabe is an ancient astronomical instrument through which it is possible to locate or calculate the position of celestial bodies such as the Sun, the Moon, the planets and the stars. It can also determine the local time by knowing the latitude, or vice versa.
Obviously it works only on a plane and on a steady, stationary thing. Fantastic instrument of the past 馃槀馃槀 Awesome!!!
https://it.wikipedia.org/wiki/Astrolabio