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公开(公告)号：US2647360A
公开(公告)日：1953-08-04
申请号：US10188449
申请日：1949-06-28
Applicant: IBM
Inventor： WAGNER JOHN L , WASHINGTON WEBB , EICHORN ROBERT N
IPC: G04C13/02
CPC classification number: G04C13/022
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