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公开(公告)号：US2375447A
公开(公告)日：1945-05-08
申请号：US50392343
申请日：1943-09-27
Applicant: JOHN WIDDICOMB COMPANY
Inventor： STUART ALEXANDER H
CPC classification number: B27C1/02 , B23Q1/4804 , B25B11/005
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