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公开(公告)号：US3504137A
公开(公告)日：1970-03-31
申请号：US3504137D
申请日：1966-12-07
Applicant: TESLA NP
Inventor： PTACKOVA VERA , PTACEK MIROSLAV
CPC classification number: H04R19/04 , H04R1/38 , H04R19/005
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