Sucker rod jerk absorber,申请号US19370177340-传众专利搜索

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发明名称	Sucker rod jerk absorber
摘要
申请公布号	US2153816(A)	申请公布日期	1939.04.11
申请号	US19370177340	申请日期	1937.11.30
申请人	HARWOOD STEVENS BEN	发明人	STEVENS BEN HARWOOD
分类号	E21B17/07	主分类号	E21B17/07
代理机构		代理人
主权项
地址

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