Improvements in or relating to method of making rigid headed metal articles, particularly hollow poppet valves, and the improved articles resulting therefrom,申请号GB19400009516-传众专利搜索

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发明名称	Improvements in or relating to method of making rigid headed metal articles, particularly hollow poppet valves, and the improved articles resulting therefrom
摘要
申请公布号	GB543573(A)	申请公布日期	1942.03.04
申请号	GB19400009516	申请日期	1940.05.30
申请人	THOMPSON PRODUCTS, INCORPORATED	发明人
分类号	B21K1/22	主分类号	B21K1/22
代理机构		代理人
主权项
地址

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