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发明名称
摘要
申请公布号
DE2104966(A1)
申请公布日期
1972.08.17
申请号
DE19712104966
申请日期
1971.02.03
申请人
发明人
分类号
E21F1/04
主分类号
E21F1/04
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代理人
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地址
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