Oil well sealing device,申请号GB19290032353-传众专利搜索

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发明名称	Oil well sealing device
摘要
申请公布号	GB338692(A)	申请公布日期	1930.11.27
申请号	GB19290032353	申请日期	1929.10.24
申请人	MABEL MCMAHAN	发明人
分类号	E21B33/05	主分类号	E21B33/05
代理机构		代理人
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