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公开(公告)号：US2799931A
公开(公告)日：1957-07-23
申请号：US55354655
申请日：1955-12-16
Applicant: ESKO EARL E
Inventor： ESKO EARL E
IPC: A01J21/02
CPC classification number: A01J21/02 , Y10T83/2166
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