When Chongzhen asked Tang Ruowang to cast cannons, he made a request, which was to teach the technology to the Ordnance Bureau of the Ministry of Industry. Jiao Xu and Zhao Zhong were both officials of the Ministry of Industry. They were obviously people sent by the Ministry of Industry to learn the technology, and it seemed that Both of them are very good students. They have already mastered Tang Ruowang's cannon-casting skills....
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