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公开(公告)号：US2221918A
公开(公告)日：1940-11-19
申请号：US23623838
申请日：1938-10-21
Applicant: HALL MFG CO
Inventor： HALL ERNEST A , BOHN KENNETH R
IPC: B24B15/04
CPC classification number: B24B15/04 , Y10T82/2593
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