Rat hole drilling mechanism,申请号US19380206175-传众专利搜索

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法人/股东/高管

发明名称	Rat hole drilling mechanism
摘要
申请公布号	US2131830(A)	申请公布日期	1938.10.04
申请号	US19380206175	申请日期	1938.05.05
申请人	ACKERMAN EDWARD D	发明人	ACKERMAN EDWARD D.
分类号	E21B3/04;E21B15/04;E21B19/14	主分类号	E21B3/04
代理机构		代理人
主权项
地址

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