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发明名称
摘要
申请公布号
BG18088(A1)
申请公布日期
1974.09.02
申请号
BG19720019991
申请日期
1972.03.16
申请人
发明人
分类号
E21C35/18;(IPC1-7):E21C35/18;E21C25/46
主分类号
E21C35/18
代理机构
代理人
主权项
地址
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