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发明名称
Mine roof bolt installation
摘要
申请公布号
US2829502(A)
申请公布日期
1958.04.08
申请号
US19530398826
申请日期
1953.12.17
申请人
DEMPSEY JOSEPH B
发明人
DEMPSEY JOSEPH B.
分类号
E21D20/02
主分类号
E21D20/02
代理机构
代理人
主权项
地址
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