[Various problems in the improvement of hearing aids].
D003638:Deafness / Q000534:rehabilitation*; D004867:Equipment Design / Q000592:standards; D006310:Hearing Aids / Q000592:standards*; D006801:Humans; D013677:Medical Laboratory Science / Q000592:standards; D014586:USSR
Nekotorye voprosy sovershenstvovaniia slukhoproteznoĭ pomoshchi.