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发明名称
Improvements relating to the construction of wells
摘要
申请公布号
GB335184(A)
申请公布日期
1930.09.15
申请号
GB19300009406
申请日期
1929.04.15
申请人
REUBEN CARLTON BAKER
发明人
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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