Tongchuan Masu kera injinan ɗagawa ne Tongchuan sha'anin hadawa samarwa, bincike da ci gaba, masana'antu, da kuma tallace-tallace na Tongchuan dagawa kayan aiki, Tongchuan dagawa inji, Tongchuan dagawa kayan aiki da kuma ayyuka! Amintaccen inganci, fifiko farashin, m bayan- sabis na tallace-tallace, ya cancanci amincewa!