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公开(公告)号：US2820277A
公开(公告)日：1958-01-21
申请号：US54262055
申请日：1955-10-25
Applicant: KARL FORSTER
Inventor： KARL FORSTER
CPC classification number: A44B18/0038 , D06C29/00 , Y10S297/06 , Y10T24/27
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