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   The material of locks can be basically divided into two categories: wood locks and metal locks. Wood locks are produced through a series of processes including sawing, chopping, drilling, and polishing. Metal locks, on the other hand, require metallurgy processes such as smelting, casting, cutting, welding, riveting, inlaying, drilling, and polishing. It is unknown how much meticulous labor goes into making a lock from raw materials to completion.Through the invention, creation, and improvement of countless skilled craftsmen over the generations, the production of locks can be said to be in the billions, making it difficult to come up with an exact number. Looking at the locks that have been passed down, there are undoubtedly many fine pieces, all of which are the crystallization of the wisdom of ancient craftsmen. It is possible that because locks are themselves items that reflect secrecy, the art of lock-making has been passed down within the craftspeople's community from generation to generation, with few literati and scholars writing about it in their works. This has led to a scarcity of records in historical texts, official histories, and even unofficial histories, so there is virtually no research on the art of locks to this day.Whether it is Wan Hui or Han Shan Shide, they themselves have certain virtues and moral practices, or they return thousands of miles, or they can live harmoniously and happily, so they are revered by the people as happy and harmonious divine beings. In the past, people regarded harmony as the god of marriage, and had the nickname of "joyful and joyful". People drew pictures, molded their images, and used them to wish for good luck. The common image of Harmony and Harmony is full of fluffy smiles, one holding a blooming lotus flower, the other holding a lid box (or a wish, a jewel), which means harmony (he) and harmony (he). The image of Harmony and Harmony is often displayed and hung at weddings, or hung in the hands of the hall for the whole year, taking the meaning of harmony and good luck. Ceramic, clay, and wood carvings also have images of Harmony and Harmony, placed on tables, cabinets, to decorate and wish for good luck.