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公开(公告)号：US2331294A
公开(公告)日：1943-10-12
申请号：US40714641
申请日：1941-08-16
Applicant: SUPER SAGLESS SPRING COMPANY
Inventor： BANK ALBERT M , ALEXANDER NICHOLAS
IPC: B21F35/04
CPC classification number: B21F35/04
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