Well plugging device,申请号US19300439634-传众专利搜索

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发明名称	Well plugging device
摘要
申请公布号	US1840379(A)	申请公布日期	1932.01.12
申请号	US19300439634	申请日期	1930.03.28
申请人	WRIGHTER CHARLES N	发明人	WRIGHTER CHARLES N.
分类号	E21B33/128	主分类号	E21B33/128
代理机构		代理人
主权项
地址

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