the use of practice u0431u0438u043eu0430u043au0443u0441u0442u0438u0447u0435u0441u043au043eu0433u043e u043eu0442u043fu0443u0433u0438u0432u0430u043du0438u00a0 birds in u0445u043eu0437u00a0u0439u0441u0442u0432u0435u043du043du043eu0439 de u00a0u0442u0435u043bu044cu043du043eu0441u0442u0438 rights. the essence of the u0438u0437u043eu0431u0440u0435u0442u0435u043du0438u00a0 -- improving the effectiveness of u0434u0435u0439u0441u0442u0432u0438u00a0 u0431u0438u043eu0430u043au0443u0441u0442u0438u0447u0435u0441u043au0438u0445 u0440u0435u043fu0435u043bu043bu0435u043du0442u043eu0432 to reduce material costs in the u043eu0442u043fu0443u0433u0438u0432u0430u043du0438u00a0 birds u0434u043eu0441u0442u0438u0433u0430u0435u0442u0441u00a0 the application of u043fu043eu0432u043eu0440u0430u0447u0438u0432u0430u044eu0449u0438u0445u0441u00a0 radiators of sound, with a u043eu0441u0443u0449u0435u0441u0442u0432u043bu00a0u0435u0442u0441u00a0 from energy u043fu043eu0434u0432u043eu0434u0438u043cu043eu0433u043e sound signal (2).
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