Well drilling rotary,申请号US19400356533-传众专利搜索

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发明名称	Well drilling rotary
摘要
申请公布号	US2299549(A)	申请公布日期	1942.10.20
申请号	US19400356533	申请日期	1940.09.12
申请人	OIL WELL SUPPLY COMPANY	发明人	MAIER AUGUST R.;SHIMER JOHN M.
分类号	E21B3/04	主分类号	E21B3/04
代理机构		代理人
主权项
地址

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