Method of making tapered tubes,申请号US19370178417-传众专利搜索

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发明名称	Method of making tapered tubes
摘要
申请公布号	US2154392(A)	申请公布日期	1939.04.11
申请号	US19370178417	申请日期	1937.12.06
申请人	BARNHART GEORGE E	发明人	BARNHART GEORGE E.
分类号	B21C37/18	主分类号	B21C37/18
代理机构		代理人
主权项
地址

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