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公开(公告)号：US2065275A
公开(公告)日：1936-12-22
申请号：US3575635
申请日：1935-08-12
Applicant: HESTER DONALD M
Inventor： HESTER DONALD M
IPC: B21D53/26
CPC classification number: B21D53/264 , Y10T29/49504
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