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1.Method and apparatus for the manufacture of a circular spring from a straight helical tension spring 失效
标题翻译: 从直线螺旋张力弹簧制造圆形弹簧的方法和装置公开(公告)号:US3426410A
公开(公告)日:1969-02-11
申请号:US3426410D
申请日:1966-08-29
申请人: JAKOB KIRCHGASSER
发明人: KIRCHGASSER JAKOB
CPC分类号: B21F35/00 , Y10T29/49609 , Y10T29/49826 , Y10T29/5137 , Y10T29/53622