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公开(公告)号：US2994429A
公开(公告)日：1961-08-01
申请号：US53141955
申请日：1955-08-30
Applicant: IBM
Inventor： LUHN HANS P , WILSON EDWARD S , STAHL WILLIAM L , BERG DONALD P , DUSTMAN WILLIAM S
CPC classification number: B07C5/20
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