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during the reign of Emperor Hailingwang ???, which places it firmly in the mid-12th century. The critical piece of evidence comes from a notation within this document. It states that the method used to print paper money with "????" , which translates to "copper plate with engraved patterns/characters", using individual copper characters arranged on a plate for printing the identifying code of the money to be circulated. Another book in 1193 CE that describes the use of clay movable type is the

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