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公开(公告)号：US3158080A
公开(公告)日：1964-11-24
申请号：US7867460
申请日：1960-12-27
Applicant: IBM
Inventor： BLAZENSKY JR NICHOLAS J , BUCKINGHAM ROBERT L
IPC: G03D5/00
CPC classification number: G03D5/006
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