Anwani Ujenzi wa 7-16, Na. 188, Kusini mwa 4 Gonga Barabara ya Magharibi, Beijing, China Barua yangshan@const-mach.com chenyoufeng@const-mach.com liuyapeng@const-mach.com Simu Mheshimiwa Yang: 15010377396. Mheshimiwa Chen: 13801306377. Mheshimiwa Liu: 15233730575. Saa za kufanya kazi Jumatatu-Ijumaa: 9 asubuhi hadi 6 jioni Jumamosi, Jumapili: Imefungwa
