The printing press is a classic combinatorial innovation. Each of its key elements—the movable type, the ink, the paper and the press itself—had been developed separately well before Johannes Gutenberg printed his first Bible in the 15th century. Movable type, for instance, had been independently conceived by a Chinese blacksmith named Pi Sheng four centuries earlier. The press itself was adapted from a screw press that was being used in Germany for the mass production of wine.
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