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公开(公告)号：US1903987A
公开(公告)日：1933-04-18
申请号：US31231428
申请日：1928-10-13
Applicant: INVENTIA PATENT VERWERT GES
Inventor： OLOF ENGBERG AXEL , ERIK AHNSTROM
IPC: D06F15/00
CPC classification number: D06F15/00
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