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发明名称
Rock drilling tool
摘要
申请公布号
US2617631(A)
申请公布日期
1952.11.11
申请号
US19480057000
申请日期
1948.10.28
申请人
INGERSOLL-RAND COMPANY
发明人
SHEPHERD BENJAMIN F.
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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