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经营范围
发明名称
Earth boring apparatus
摘要
申请公布号
US2047111(A)
申请公布日期
1936.07.07
申请号
US19320608295
申请日期
1932.04.29
申请人
CHICAGO PNEUMATIC TOOL COMPANY
发明人
REED CLARENCE E.
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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