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发明名称
Under-reamer
摘要
申请公布号
US2879038(A)
申请公布日期
1959.03.24
申请号
US19570692677
申请日期
1957.10.28
申请人
JOHNSON CHESTER F
发明人
JOHNSON CHESTER F.
分类号
B23B51/00
主分类号
B23B51/00
代理机构
代理人
主权项
地址
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