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发明名称
摘要
申请公布号	JPS54901(U)	申请公布日期	1979.01.06
申请号	JP19770072624U	申请日期	1977.06.06
申请人		发明人
分类号	E21B7/28;E21B10/32;E21B44/00;E21B44/02;(IPC1-7):E21B9/26;E02D17/148	主分类号	E21B7/28
代理机构		代理人
主权项
地址

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