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公开(公告)号：US3155063A
公开(公告)日：1964-11-03
申请号：US5573760
申请日：1960-09-13
Applicant: ERIKOISPUTKI OY
Inventor： KALERVO MALKKI EINO , VALENTIN SILDE
IPC: B21C37/12
CPC classification number: B21C37/12
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