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发明名称
摘要
申请公布号	BG16899(A1)	申请公布日期	1973.04.25
申请号	BG19710017897	申请日期	1971.06.24
申请人		发明人
分类号	(IPC1-7):E21C11/00	主分类号	(IPC1-7):E21C11/00
代理机构		代理人
主权项
地址

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