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发明名称
Pipe slips for use in well drilling operations
摘要
申请公布号
GB374841(A)
申请公布日期
1932.06.06
申请号
GB19310003807
申请日期
1931.02.06
申请人
THE NATIONAL SUPPLY CORPORATION
发明人
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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