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Rh have no evidence that he experimented with types, or that he printed anything in Strasburg between 1439 and 1457. It is not even established that Mentel was the first practical printer in Strasburg, for there is evidence that he began to print there in partnership with one Henry Eggestein, who was a man of superior ability and of greater distinction, a master of arts and philosophy.

Mentel did not affix his name to any of his books before 1473, but he had then printed many large theological works. Schœpflin says that he soon made himself rich by his industry and his sagacity in the selection of salable books. He was a shrewd publisher, the first who issued a descriptive catalogue, and employed agents for the sale of his works.