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公开(公告)号：US2302168A
公开(公告)日：1942-11-17
申请号：US32373240
申请日：1940-03-13
Applicant: SHARPLES CORP
Inventor： AYRES ARTHUR U , JEAN ESMLEU
IPC: B04B11/02
CPC classification number: B04B11/02
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