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公开(公告)号：US2352952A
公开(公告)日：1944-07-04
申请号：US37009840
申请日：1940-12-14
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： HAGLUND HAKON H , DICKEY ALBERT W , NEWMAN THOMAS A
IPC: H03M7/40
CPC classification number: H03M7/4025
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