A Chinese Biographical Dictionary/Chao Kuo
169 Chao Kuo 趙遏. 2nd. cent. B.C. An official under the Emperor Wu Ti of the Han dynasty, who is said by some to have been the first to substitute oxen for human labour in ploughing.
169 Chao Kuo 趙遏. 2nd. cent. B.C. An official under the Emperor Wu Ti of the Han dynasty, who is said by some to have been the first to substitute oxen for human labour in ploughing.