Locking mechanism for well drilling rotaries,申请号US19460698219-传众专利搜索

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发明名称	Locking mechanism for well drilling rotaries
摘要
申请公布号	US2443744(A)	申请公布日期	1948.06.22
申请号	US19460698219	申请日期	1946.09.20
申请人	OIL WELL SUPPLY COMPANY	发明人	MOHNKERN CHARLES L.
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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