A method and a device for making a biased spiral wound tension spring as well as a spiral spring made therewith,申请号GB19470016928-传众专利搜索

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发明名称	A method and a device for making a biased spiral wound tension spring as well as a spiral spring made therewith
摘要
申请公布号	GB624813(A)	申请公布日期	1949.06.16
申请号	GB19470016928	申请日期	1947.06.26
申请人	ABRAHAM DE VRIES;LOUIS DE VRIES	发明人
分类号	B21F3/04	主分类号	B21F3/04
代理机构		代理人
主权项
地址

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