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公开(公告)号：US3021439A
公开(公告)日：1962-02-13
申请号：US86058259
申请日：1959-12-18
Applicant: IBM
Inventor： ANDERSON JOHN L
CPC classification number: G11C19/32 , F02P17/02 , G01R13/208 , Y10S505/83
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