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公开(公告)号：US2277949A
公开(公告)日：1942-03-31
申请号：US36621740
申请日：1940-11-19
Applicant: SHARPLES CORP
Inventor： HIESTAND BATH WILMER
IPC: B04B11/02
CPC classification number: B04B11/02 , Y10T137/7903
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