Process of making hollow valves,申请号US19420434238-传众专利搜索

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发明名称	Process of making hollow valves
摘要
申请公布号	US2392175(A)	申请公布日期	1946.01.01
申请号	US19420434238	申请日期	1942.03.11
申请人	THOMPSON PRODUCTS, INC.	发明人	NORTON SAMUEL H.
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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