石油钻机和修井机井架底座承载能力检测评定方法及分级规范
The specification for grading and evaluating the loading capacity on derricks and substructure of the drilling rig and working rig

2012-08-23

石油钻机和修井机井架承载能力检测评定方法及分级规范
The specification for grading and evaluating the loading capacity on derricks of the drilling rig and working rig

2019-11-04

石油井架用异型及圆形无缝钢管
Shaped and round seamless steel tubes for oil derrick

2014-05-06