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简介：Originally, these three factories were all located in the inner city, but after a huge explosion occurred in the gunpowder factory in May of the sixth year of Tianqi, killing ten thousand people and causing the death of Emperor Tianqi's youngest son, the three factories were all moved to the outer city, and their names were also changed. , for example, the Wanggong Factory that made gunpowder was renamed Anmin Factory.