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公开(公告)号：US3274671A
公开(公告)日：1966-09-27
申请号：US47904865
申请日：1965-08-04
Applicant: ZD Y V I PLZEN NARODNI PODNIK
Inventor： JOSEF HAUER , ZDENEK KOBERA
IPC: B21K21/00
CPC classification number: B21K21/00 , Y10T29/49428
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