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发明名称
摘要
申请公布号	JP2781612(B2)	申请公布日期	1998.07.30
申请号	JP19890224030	申请日期	1989.08.30
申请人		发明人
分类号	E21C37/06;E21C37/08;(IPC1-7):E21C37/08	主分类号	E21C37/06
代理机构		代理人
主权项
地址

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