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公开(公告)号：US1780526A
公开(公告)日：1930-11-04
申请号：US24287527
申请日：1927-12-27
Applicant: KIEFFER PAPER MILLS
Inventor： KIEFFER JOHN E
IPC: B31F1/07
CPC classification number: B31F1/07 , B31F2201/0733 , B31F2201/0753 , B31F2201/0758 , B31F2201/0782
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