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发明名称
Improvements in rotary well drilling equipment
摘要
申请公布号
GB357912(A)
申请公布日期
1931.10.01
申请号
GB19310002020
申请日期
1931.01.21
申请人
THE NATIONAL SUPPLY CORPORATION
发明人
分类号
E21B3/04;H01F41/16
主分类号
E21B3/04
代理机构
代理人
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