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经营范围
发明名称
Rock drilling mechanism
摘要
申请公布号
US2081922(A)
申请公布日期
1937.06.01
申请号
US19350005442
申请日期
1935.02.07
申请人
SULLIVAN MACHINERY COMPANY
发明人
GARTIN ELMER G.
分类号
E21B19/086
主分类号
E21B19/086
代理机构
代理人
主权项
地址
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