Method of making a two-headed valve stem,申请号US19500198623-传众专利搜索

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发明名称	Method of making a two-headed valve stem
摘要
申请公布号	US2754571(A)	申请公布日期	1956.07.17
申请号	US19500198623	申请日期	1950.12.01
申请人	ALCO VALVE COMPANY	发明人	STEFFENS OSCAR C.
分类号	B21J9/06;B21K1/20	主分类号	B21J9/06
代理机构		代理人
主权项
地址

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