Drilling apparatus and the like,申请号US19260151305-传众专利搜索

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发明名称	Drilling apparatus and the like
摘要
申请公布号	US1836998(A)	申请公布日期	1931.12.15
申请号	US19260151305	申请日期	1926.11.29
申请人	THULLEN LOUIS H	发明人	THULLEN LOUIS H.
分类号	E21B19/08	主分类号	E21B19/08
代理机构		代理人
主权项
地址

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