Separable housing for drilling rigs and clutch mechanisms,申请号US19550516064-传众专利搜索

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发明名称	Separable housing for drilling rigs and clutch mechanisms
摘要
申请公布号	US2891768(A)	申请公布日期	1959.06.23
申请号	US19550516064	申请日期	1955.06.17
申请人	THE NATIONAL SUPPLY COMPANY	发明人	CORDREY RICHARD N.
分类号	E21B19/00	主分类号	E21B19/00
代理机构		代理人
主权项
地址

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