Hand mill produced feudal society, and steam mill produced the source.

1late 8th century. Steam mill is the product of modern industrial development, and its invention and use can be traced back to the late18th century. Compared with manual tools such as hand mill, steam mill has the advantages of automation, high efficiency and high precision, which can greatly improve production efficiency and product quality and promote the process of industrialization and modernization. Therefore, the influence of steam engine on modern society can not be ignored. Hand mill is a traditional small grain processing tool, which is common in rural areas and some remote areas in China. It can process grains into powder, which can be used to make pasta, biscuits, cakes and other delicacies. Hand mill is mainly composed of stone mill, runner, grinding disc and other parts.