Beijing SDZ Laser S&T Co,. Ltd Address: 5thfloor,Fangheghengyuan Building B,NO.16 Guanghua Rd., Industrial Development Area, TongZHOU district, Beijing, China. Tel:+86010-61503738　Fax:+86010-61503478 Mobile phone: 0086-13910994118 Technique Support: +86010-60541024 E-mail:saidazihl @ hotmail.com