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公开(公告)号：US2324221A
公开(公告)日：1943-07-13
申请号：US29589239
申请日：1939-09-21
Applicant: IBM
Inventor： LUHN HANS P
CPC classification number: D04B15/66 , B23Q15/00 , Y10T74/131 , Y10T74/22
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