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经营范围
发明名称
Improvements in or relating to well drilling hook assemblies
摘要
申请公布号
GB740750(A)
申请公布日期
1955.11.16
申请号
GB19520012735
申请日期
1952.05.20
申请人
THE NATIONAL SUPPLY COMPANY;THE OIL WELL ENGINEERING COMPANY LIMITED
发明人
分类号
E21B19/04
主分类号
E21B19/04
代理机构
代理人
主权项
地址
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