It is also not conducive to mass production of partsX is the first letter of the pinyin of planets. Developed by General Bureau of the First Ministry of Machinery. Southern mainly produces B series. Focus on imitating research and development.Planetary cycloid reducer began to originate in Germany. The first J in JXJ is the first letter of Jiangmen Pinyin. The thi...2021.08.04 02:25china-sr.com