Shut-off device for wells,申请号US19300425481-传众专利搜索

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发明名称	Shut-off device for wells
摘要
申请公布号	US1842381(A)	申请公布日期	1932.01.26
申请号	US19300425481	申请日期	1930.02.03
申请人	ANGELL FRANK B	发明人	ANGELL FRANK B.
分类号	E21B34/02	主分类号	E21B34/02
代理机构		代理人
主权项
地址

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