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公开(公告)号：US3209889A
公开(公告)日：1965-10-05
申请号：US25887663
申请日：1963-02-15
Applicant: OTTO METZGER HANS
Inventor： OTTO METZGER HANS
CPC classification number: E04F15/04 , B27M3/04 , B27M3/06 , E04F2201/01
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