Production of seamless tubes,申请号US19270179612-传众专利搜索

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发明名称	Production of seamless tubes
摘要
申请公布号	US1789721(A)	申请公布日期	1931.01.20
申请号	US19270179612	申请日期	1927.03.30
申请人	EWALD ALVERMANN	发明人	ALVERMANN EWALD
分类号	B21B21/00;B21B23/00	主分类号	B21B21/00
代理机构		代理人
主权项
地址

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