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公开(公告)号：US2545204A
公开(公告)日：1951-03-13
申请号：US57707445
申请日：1945-02-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： HICKMAN CLARENCE N , GRAUMANN RAYMOND L , MALLINA RUDOLPH F
IPC: F42B25/00
CPC classification number: F42B25/00
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