ВСН 156-83 Инструкция по проектированию унифицированных углов поворота и разбивке кривых из гнутых отводов

68 Pages · 2016 · 5.18 MB · Russian
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“ Learn to light a candle in the darkest moments of someone’s life. Be the light that helps others see; it is what gives life its deepest significance. ” ― Roy T. Bennett
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