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公开(公告)号：US2451812A
公开(公告)日：1948-10-19
申请号：US52302444
申请日：1944-02-19
Applicant: NCR CO
Inventor： DESCH JOSEPH R , GULDEN ERNEST V , MUMMA ROBERT E
IPC: H04L19/00
CPC classification number: H04L19/00
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