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发明名称
摘要
申请公布号
BE684400(A)
申请公布日期
1967.01.20
申请号
BED684400
申请日期
1966.07.20
申请人
发明人
分类号
E21C25/54;E21C27/34;E21C35/16
主分类号
E21C25/54
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代理人
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地址
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