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公开(公告)号：US3388216A
公开(公告)日：1968-06-11
申请号：US46949165
申请日：1965-07-06
Applicant: IBM
Inventor： BROOKE ALVIN W , KUNTZLEMAN HARRY C , MARKEY HAROLD G
CPC classification number: H04L25/0262 , H04L7/0331
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