Process for producing helically-coiled springs of uniform length,申请号US19290340108-传众专利搜索

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发明名称	Process for producing helically-coiled springs of uniform length
摘要
申请公布号	US1779131(A)	申请公布日期	1930.10.21
申请号	US19290340108	申请日期	1929.02.15
申请人	PRATT & LETCHWORTH COMPANY	发明人	HOLNESS WALLACE
分类号	B21F3/04;B21F99/00	主分类号	B21F3/04
代理机构		代理人
主权项
地址

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