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公开(公告)号：US2697647A
公开(公告)日：1954-12-21
申请号：US10200349
申请日：1949-06-29
Applicant: FERRIS MFG COMPANY
Inventor： JOSEPH STINGL , HENRY LUCKAS
IPC: A47B63/06
CPC classification number: A47B63/065
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