Rotary blowout preventer for well apparatus,申请号US19530361736-传众专利搜索

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发明名称	Rotary blowout preventer for well apparatus
摘要
申请公布号	US2760795(A)	申请公布日期	1956.08.28
申请号	US19530361736	申请日期	1953.06.15
申请人	SHAFFER TOOL WORKS	发明人	VERTSON JOHN A.
分类号	E21B33/08	主分类号	E21B33/08
代理机构		代理人
主权项
地址

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