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经营范围
发明名称
Underreamer
摘要
申请公布号
US1743528(A)
申请公布日期
1930.01.14
申请号
US19270182520
申请日期
1927.04.09
申请人
JOHN GRANT
发明人
CAMPBELL LAWRENCE
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
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地址
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