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发明名称
Expansible underreamer
摘要
申请公布号
US1750629(A)
申请公布日期
1930.03.18
申请号
US19280312476
申请日期
1928.10.15
申请人
H. C. SMITH MANUFACTURING COMPANY
发明人
CRUM ROLAND R.
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
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地址
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