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The GRiDPad was considered the first tablet marketed
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The GRiDPad was considered the first tablet marketed to consumers and prior to its full release, it was used exclusively by the U.S. Army. Weighing 4.5 pounds and featuring a 9 x 12 inch, monochromatic touchscreen display, this device came with a stylus pen and ran the MS-DOS system. GRiD Systems Corp. was absorbed by Samsung in 1988, and Samsung manufactured the GRiDPad 1910 one year later.(Credit: Samsung)

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Tablet history dates back two decades before iPad

Since the advent of the home computer, tech companies have endeavored to streamline their designs to make computers more mobile. The laptop computer was a success, but progress didn't stop there--tech companies including Samsung and Apple began developing tablets, handheld computers with various features built in a single device not much larger than its display. Here is a look at tablet computers spanning the 1980s, 1990s, 2000s and 2010s.