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公开(公告)号：US3004135A
公开(公告)日：1961-10-10
申请号：US80030659
申请日：1959-03-18
Applicant: HOESCH ROHRWERKE AG
Inventor： RICHARD DIENER , WERNER WENNEMANN
CPC classification number: B21C37/12 , B21C37/122 , B23K9/0325
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