Who invented the rickshaw and what is its function?

plows are also called plows. According to Cui Mang's Political Theory in the Eastern Han Dynasty, the plow was invented by Zhao Guo, the commander of the search for millet in the Western Han Dynasty. Its usage and effect are as follows: "Three plows * * * a cow, one person will plant it, and the next one will plant it." This kind of plow is the three-legged plow that is still in use in the northern countryside. There are several kinds of rickshaws with one foot, two feet, three feet and even four feet, with two feet and three feet being more common. According to Wang Zhen's "Agricultural Book Leikuangmen", the concrete structure of the two-legged cymbals is: "Two handles are bent upwards, three feet high, and the two feet are hollow, with a wide ridge, four turns across, and a bucket in the middle, and the seeds contained in them are all connected to the foot. There are still two shafts on the side, which can accommodate a cow. One person can lead it and another person can hold the cymbals, and the seeds are planted from the bottom. "