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发明名称
摘要
申请公布号	SU546728(A1)	申请公布日期	1977.02.15
申请号	SU19752170176	申请日期	1975.09.04
申请人		发明人
分类号	E21D23/16;F01L17/00;(IPC1-7):E21D23/16	主分类号	E21D23/16
代理机构		代理人
主权项
地址

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