Method of making deep well screens,申请号US19400329752-传众专利搜索

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发明名称	Method of making deep well screens
摘要
申请公布号	US2312459(A)	申请公布日期	1943.03.02
申请号	US19400329752	申请日期	1940.04.15
申请人	EDWARD E. JOHNSON, INCORPORATED	发明人	WILLIAMS HOWARD O.;JENS ALBERT A.
分类号	B21D28/28;B23K11/00;E21B43/08	主分类号	B21D28/28
代理机构		代理人
主权项
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