Preventing erosion of core boxes opposite the blow holes thereof,申请号US19550554219-传众专利搜索

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发明名称	Preventing erosion of core boxes opposite the blow holes thereof
摘要
申请公布号	US2800690(A)	申请公布日期	1957.07.30
申请号	US19550554219	申请日期	1955.12.20
申请人	OLSON RICHARD L	发明人	OLSON RICHARD L.
分类号	B22C7/06	主分类号	B22C7/06
代理机构		代理人
主权项
地址

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