use: in the mining and construction u0434u043bu00a0 aimed u043eu0442u0434u0435u043bu0435u043du0438u00a0 mountains of rock from the array. the essence of the u0438u0437u043eu0431u0440u0435u0442u0435u043du0438u00a0, u0437u0430u0431u043eu0438 installed on the line u0448u043fu0443u0440u043eu0432 set u0434u0432u0443u0441u043au0430u0442u043du044bu0435 lens, u043eu0440u0438u0435u043du0442u0438u0440u0443u00a0 their ramps in the neighbouring u0448u043fu0443u0440u043eu0432 lines in u0448u043fu0443 rach, for example, by a flow of working bodies, aimed to u043eu0442u0440u0430u0436u0430u0442u0435u043bu00a0u043c flows u0440u0430u0437u0432u043eu0440u0430u0447u0438u0432u0430u044eu0442u0441u00a0 and creates a common straightening slot.2).
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