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公开(公告)号：US1757239A
公开(公告)日：1930-05-06
申请号：US11612326
申请日：1926-06-15
Applicant: INVENTIA PATENT VERWERT GES
Inventor： OLOF ENGBERG AXEL , FREDRIK CARLSTEDT
IPC: A47L5/36
CPC classification number: A47L5/362 , Y10T16/473
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