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公开(公告)号：US2179388A
公开(公告)日：1939-11-07
申请号：US15151637
申请日：1937-07-01
Applicant: KAPELLA LTD
Inventor： VICTOR RODWELL REGINALD , ALBERT COOKE ERNEST
IPC: B24B17/02
CPC classification number: B24B17/021 , Y10T409/30084
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