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发明名称
Drilling apparatus
摘要
申请公布号
US1810106(A)
申请公布日期
1931.06.16
申请号
US19270243907
申请日期
1927.12.31
申请人
SULLIVAN MACHINERY COMPANY
发明人
JOHANSEN HARRY C.
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
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地址
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