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公开(公告)号：US2225225A
公开(公告)日：1940-12-17
申请号：US32456240
申请日：1940-03-18
Applicant: DAY COMPANY
Inventor： MCELEVEY CLARK A
IPC: B24B55/06
CPC classification number: B24B55/06 , Y10S29/078
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