Improvements in or relating to derrick sub-structures,申请号GB19510013053-传众专利搜索

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发明名称	Improvements in or relating to derrick sub-structures
摘要
申请公布号	GB690529(A)	申请公布日期	1953.04.22
申请号	GB19510013053	申请日期	1951.06.01
申请人	LEE C. MOORE CORPORATION	发明人
分类号	E21B15/00	主分类号	E21B15/00
代理机构		代理人
主权项
地址

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