Combination drilling valve and blow-out preventer,申请号US19300442155-传众专利搜索

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发明名称	Combination drilling valve and blow-out preventer
摘要
申请公布号	US1858352(A)	申请公布日期	1932.05.17
申请号	US19300442155	申请日期	1930.04.07
申请人	JOHN YOUNG	发明人	YOUNG JOHN
分类号	E21B33/06	主分类号	E21B33/06
代理机构		代理人
主权项
地址

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