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Catalog → L`union des Republiques Sovietiques Socialistes (l`URSS) → Les repertoires → La radiobibliotheque massive
 | Title: Under the general edition of the academician A. I. Berg | | "Mass radio library", Release 191. | | List: 6 | | Byte: 1022636 | | Note: "Mass radio library", Release 191. Under the general edition of the academician A. I. Berg the STATE POWER PUBLISHING HOUSE MOSCOW 1953 LENINGRAD of M. M. EFRUSSI Hearing aids In the brochure are described hearing aids - intensifying devices for persons with lowered, the hearing, provides schemes, electric and acoustic data of microtelephone and lamp hearing aids and their main details. The brochure contains also data on hearing, its defeats and suitability of various hearing aids depending on nature of defeat of hearing. The way of an assessment of efficiency of hearing aids is given. The main are brought data, necessary plant louses of independent production and repair of lamp hearing aids. In the appendix descriptions of the rectifier for power supply of battery hearing aids from a lighting network and a prefix to the radio receiver are given and characteristics of lamps for hearing aids are provided. | Download from site:
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