Bearing seal for drilling bits,申请号US19650490936-传众专利搜索

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发明名称	Bearing seal for drilling bits
摘要
申请公布号	US3370895(A)	申请公布日期	1968.02.27
申请号	US19650490936	申请日期	1965.09.28
申请人	DRESSER INDUSTRIES, INC.	发明人	JR. GEORGE A. CASON,
分类号	E21B10/22;E21B10/25;F16C33/78	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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