Dear dear, the order is 1. Iron farm tools 2. Drainage 3. Sagger 4. Curved plow
The plow is an agricultural tool used in primitive agriculture in primitive society. The plow was invented in the Tang Dynasty, marking the basic finalization of my country's iron plow and oxen farming methods. During the Eastern Han Dynasty, Du Shi, the prefect of Nanyang, used smelting iron to blow wind and water. During the Spring and Autumn Period and the Warring States Period, iron farm tools began to appear in our country. The sagger appeared from the late Five Dynasties to the early Northern Song Dynasty.