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发明名称
Safety device for rock drills
摘要
申请公布号
US1868685(A)
申请公布日期
1932.07.26
申请号
US19310535920
申请日期
1931.05.08
申请人
INGERSOLL-RAND COMPANY
发明人
BAYLES LEWIS C.
分类号
E21B19/086
主分类号
E21B19/086
代理机构
代理人
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地址
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