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发明名称
Rock drill
摘要
申请公布号
US2090031(A)
申请公布日期
1937.08.17
申请号
US19360084329
申请日期
1936.06.09
申请人
THE CLEVELAND ROCK DRILL COMPANY
发明人
CURTIS JOHN C.
分类号
B25D9/18
主分类号
B25D9/18
代理机构
代理人
主权项
地址
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