Rotary for well drilling,申请号US19340754319-传众专利搜索

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发明名称	Rotary for well drilling
摘要
申请公布号	US2073559(A)	申请公布日期	1937.03.09
申请号	US19340754319	申请日期	1934.11.22
申请人	OIL WELL SUPPLY COMPANY	发明人	MAIER AUGUST R.
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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