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公开(公告)号：US2276280A
公开(公告)日：1942-03-17
申请号：US30114439
申请日：1939-10-25
Applicant: SHARPLES CORP
Inventor： AYRES ARTHUR U , HILL GEORGE H
IPC: B04B11/02
CPC classification number: B04B11/02
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