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公开(公告)号：US1667785A
公开(公告)日：1928-05-01
申请号：US18079127
申请日：1927-04-04
Applicant: HILL ALEXANDER P
Inventor： HILL ALEXANDER P
IPC: A01J9/08
CPC classification number: A01J9/08 , Y10S248/907
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