tianjin Dong Fang xian Ke Petroleum Machinery co.,Ltd.,'cover',1,'introduction of the company',2,'main countries for product export',3,'product main marketing in domestic',4,'product certificate',5,'product catalog',7,'product accessory',8,'Main Teachnical Parameter of ZJ15 Truck-mounted Drilling Rig',9,'Main Teachnical Parameter of zj20 Truck-mounted Drilling Rig',11,'Main Teachnical Parameter of zj30/40 Truck-mounted Drilling Rig',13,'ZJ50/3150D Basic Teachnical Parameter of Drilling Rig',15,'zj70/4500d Basic Teachnical Parameter of Drilling Rig',17,'Main Teachnical Parameter of xj350/xj400 Workover Rig',19,'Main Teachnical Parameter of xj450/550 Workover Rig',21,'Main Teachnical Parameter of xj450/550 Workover Rig',23,'Main Teachnical Parameter of xj750 Workover Rig',25,'Main Teachnical Parameter of zj30t Trailer-mounted Drilling Rig',27,'Main Teachnical Parameter of zj40t Trailer-mounted Drilling Rig',29