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发明名称
Mine supporting structure
摘要
申请公布号
US2650475(A)
申请公布日期
1953.09.01
申请号
US19490107202
申请日期
1949.07.28
申请人
KARL GERLACH
发明人
GERLACH KARL
分类号
E21D15/43;E21D17/01;E21D17/086
主分类号
E21D15/43
代理机构
代理人
主权项
地址
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