who invented the automatic crossbow
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who invented the automatic crossbow
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who invented the crossbow in ancient china
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who invented the automatic crossbow, who invented the crossbow, what year was the crossbow invented, when was the crossbow invented, who created the crossbow, who made the first crossbow, invention of the crossbow, who used the crossbow, who invented the crossbow in ancient china, when was the crossbow invented in europe, when was the first crossbow made, history of the crossbow, when were crossbows created
