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发明名称
Mine roof supports
摘要
申请公布号
US3023862(A)
申请公布日期
1962.03.06
申请号
US19590847191
申请日期
1959.10.19
申请人
APPLICATIONS SCIENTIFIQUES
发明人
LAUNAY JEAN JOSEPH
分类号
E21D11/20;E21D11/22
主分类号
E21D11/20
代理机构
代理人
主权项
地址
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