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公开(公告)号：US2543990A
公开(公告)日：1951-03-06
申请号：US78048
申请日：1948-01-06
Applicant: DONALD F ARBUCKLE
Inventor： LEROY ROYER
CPC classification number: B25B1/125 , B23B33/00 , B23Q3/066 , Y10T82/262
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