Apparatus for drilling terrestrial bores,申请号US19380237769-传众专利搜索

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发明名称	Apparatus for drilling terrestrial bores
摘要
申请公布号	US2257733(A)	申请公布日期	1941.10.07
申请号	US19380237769	申请日期	1938.10.29
申请人	COLEMAN WILLIAM R	发明人	COLEMAN WILLIAM R.
分类号	E21B1/00	主分类号	E21B1/00
代理机构		代理人
主权项
地址

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