Jar and safety joint,申请号US19470756061-传众专利搜索

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发明名称	Jar and safety joint
摘要
申请公布号	US2557349(A)	申请公布日期	1951.06.19
申请号	US19470756061	申请日期	1947.06.20
申请人	HOWARD CLIFFORD M	发明人	HOWARD CLIFFORD M.
分类号	E21B17/06	主分类号	E21B17/06
代理机构		代理人
主权项
地址

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