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发明名称
Resilient shell with enlarged end for engagement in a mine roof
摘要
申请公布号
US3104582(A)
申请公布日期
1963.09.24
申请号
US19590786887
申请日期
1959.01.14
申请人
WHITE CLAUDE C
发明人
WHITE CLAUDE C.
分类号
E21D21/00
主分类号
E21D21/00
代理机构
代理人
主权项
地址
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