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公开(公告)号：US2633688A
公开(公告)日：1953-04-07
申请号：US27123152
申请日：1952-02-12
Applicant: HUFFMAN MFG COMPANY
Inventor： YECK JOHN D , YECK WILLIAM S
IPC: A01D34/82
CPC classification number: A01D34/822 , A01D2101/00
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