Considered the first step into the world of modern photocopying, the polygraph machine was among the first widely used devices to successfully produce an exact copy of an original written work. Designed and patented by one of history's greatest innovators, Sir Marc Isambard Brunel, in 1799, the polygraph was the only device in the early 19th century that was able to instantly duplicate letters; the copying press, which emerged in 1780, could only transfer ink to tissue, not paper. http://goo.gl/
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