Polished rod protector and blow deflector,申请号US19630258294-传众专利搜索

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发明名称	Polished rod protector and blow deflector
摘要
申请公布号	US3270810(A)	申请公布日期	1966.09.06
申请号	US19630258294	申请日期	1963.02.13
申请人	JOHNSTON LESLIE A	发明人	JOHNSTON LESLIE A.
分类号	E21B33/08	主分类号	E21B33/08
代理机构		代理人
主权项
地址

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