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公开(公告)号：US3139172A
公开(公告)日：1964-06-30
申请号：US21149262
申请日：1962-07-23
Applicant: FILPER CORP
Inventor： MCCLELLAND ETHERIDGE R , OLSON CLARENCE R
IPC: A23N4/14
CPC classification number: A23N4/14
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