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公开(公告)号：US1793682A
公开(公告)日：1931-02-24
申请号：US22996327
申请日：1927-10-31
Applicant: GROFF PAPER COMPANY
Inventor： EDOR DAHL
IPC: A47K10/42
CPC classification number: A47K10/427 , A47K2010/428
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