Method of producing drill-jarring bars,申请号US19320588220-传众专利搜索

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发明名称	Method of producing drill-jarring bars
摘要
申请公布号	US1907190(A)	申请公布日期	1933.05.02
申请号	US19320588220	申请日期	1932.01.22
申请人	STUDNICKA ALBERT J	发明人	STUDNICKA ALBERT J.
分类号	E21B4/08	主分类号	E21B4/08
代理机构		代理人
主权项
地址

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