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发明名称
Rock drill
摘要
申请公布号
US1884651(A)
申请公布日期
1932.10.25
申请号
US19290337061
申请日期
1929.02.02
申请人
SULLIVAN MACHINERY COMPANY
发明人
GARTIN ELMER G.
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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