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一位农民在16年内拿到19项实用新型专利。他就是江苏省丰县经济开发区特种机械发明人李善文。1991年,李善文承包的土地都种上了山药。由于
A farmer got 19 utility model patents in 16 years. He is Li Shanwen, inventor of special machinery for Fengxian Economic Development Zone in Jiangsu Province. In 1991, Li Shan-wen contracted the land planted yam. due to