Spiral-pipe machine,申请号US19240755766-传众专利搜索

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发明名称	Spiral-pipe machine
摘要
申请公布号	US1788220(A)	申请公布日期	1931.01.06
申请号	US19240755766	申请日期	1924.12.13
申请人	THE AMERICAN ROLLING MILL COMPANY	发明人	WILLIAMS FREDERICK L.
分类号	B21C37/12;B23K9/032	主分类号	B21C37/12
代理机构		代理人
主权项
地址

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