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the rockets with frames meant to keep them separated, and the launchers were capable of firing multiple rockets at once. Textual evidence and illustrations of various early rocket launchers are found in the 1510 edition of the Wujing Zongyao translated by Needham and others at Princeton University. (The original Wujing Zongyao was compiled between 1040 and 1044 and described the discovery of black powder but preceded the invention of the rocket. Partial copies

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