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发明名称
摘要
申请公布号	JPS6250292(U)	申请公布日期	1987.03.28
申请号	JP19850138981U	申请日期	1985.09.11
申请人		发明人
分类号	E21B19/15;B61H9/00;B61H9/04;B63B35/44;(IPC1-7):E21B19/15	主分类号	E21B19/15
代理机构		代理人
主权项
地址

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