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发明名称
Rock drill
摘要
申请公布号
US2203954(A)
申请公布日期
1940.06.11
申请号
US19380236221
申请日期
1938.10.21
申请人
THE CLEVELAND ROCK DRILL COMPANY
发明人
FEUCHT ALBERT
分类号
E21B19/083
主分类号
E21B19/083
代理机构
代理人
主权项
地址
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