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经营范围
发明名称
Rock drill
摘要
申请公布号
US2047981(A)
申请公布日期
1936.07.21
申请号
US19340751020
申请日期
1934.11.01
申请人
SULLIVAN MACHINERY COMPANY
发明人
OSGOOD CHARLES F.
分类号
E21B19/084
主分类号
E21B19/084
代理机构
代理人
主权项
地址
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