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公开(公告)号：US3492853A
公开(公告)日：1970-02-03
申请号：US3492853D
申请日：1967-09-06
Applicant: BLISS CO
Inventor： GROSS JOHN
CPC classification number: B23D35/001 , B21B15/0007 , B21B2015/0014 , B23D15/02 , B23D15/10 , Y10S83/923 , Y10T83/0581 , Y10T225/371
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