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发明名称
Improvements in or relating to cable-tool drilling machines
摘要
申请公布号
GB561543(A)
申请公布日期
1944.05.24
申请号
GB19420004774
申请日期
1942.04.10
申请人
RUSTON-BUCYRUS LIMITED
发明人
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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