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发明名称
Rock drill
摘要
申请公布号
US2019163(A)
申请公布日期
1935.10.29
申请号
US19340754203
申请日期
1934.11.22
申请人
INGERSOLL-RAND COMPANY
发明人
SLATER FRED M.
分类号
B25D9/20;E21B6/06
主分类号
B25D9/20
代理机构
代理人
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