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公开(公告)号：US2840178A
公开(公告)日：1958-06-24
申请号：US47963555
申请日：1955-01-03
Applicant: TESLA NP
Inventor： ALES BOLESLAV
IPC: H04R1/28
CPC classification number: H04R1/24 , H04R1/2803
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