青云翻译

Zhoucun copper ring instrument making skills "group according to 7-- forging forming

Zhoucun of brass musical instrument making skills groups according to the 7-forge forming

Zhou Cuntong the sound musical instrument manufacture technique" the group according to 7- hammers the formation

zhoucun copper ring for musical instrument making skills of the Group 7 - Forging molding

Zhoucun of brass musical instrument making skills groups according to the 7-forge forming