SEALING ASSEMBLY OF BEARING OF ROLLER OF DRILLING BIT,申请号SU19833667354-传众专利搜索

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发明名称	SEALING ASSEMBLY OF BEARING OF ROLLER OF DRILLING BIT
摘要
申请公布号	SU1222808(A1)	申请公布日期	1986.04.07
申请号	SU19833667354	申请日期	1983.11.30
申请人	SEJFI RAVIL N,SU	发明人	SEJFI RAVIL N,SU
分类号	E21B10/25;E21B10/22;(IPC1-7):E21B10/22	主分类号	E21B10/25
代理机构		代理人
主权项
地址

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