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发明名称
Rotary drillino bir
摘要
申请公布号
US2325745(A)
申请公布日期
1943.08.03
申请号
US19390280100
申请日期
1939.06.20
申请人
CRUM ROLAND R
发明人
CRUM ROLAND R.
分类号
E21B10/10
主分类号
E21B10/10
代理机构
代理人
主权项
地址
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