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公开(公告)号：US2431018A
公开(公告)日：1947-11-18
申请号：US48064243
申请日：1943-03-26
Applicant: IBM
Inventor： PAILEY WILLIAM J A , PANISSIDI HUGO A
IPC: G01S5/20
CPC classification number: G01S5/20
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