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公开(公告)号：US2863520A
公开(公告)日：1958-12-09
申请号：US49360155
申请日：1955-03-11
Applicant: GEN DYNAMICS CORP
Inventor： MANLEY FRED A , ANKERMAN PAUL W
IPC: H04R7/20
CPC classification number: H04R7/20 , H04R2307/201
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