Improvements relating to the manufacture of rings,申请号GB19420006347-传众专利搜索

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发明名称	Improvements relating to the manufacture of rings
摘要
申请公布号	GB550938(A)	申请公布日期	1943.02.01
申请号	GB19420006347	申请日期	1942.05.11
申请人	HENRY SAMUEL DAW	发明人
分类号	B21D53/16	主分类号	B21D53/16
代理机构		代理人
主权项
地址

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