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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 12, pp. 22–24, December, 1969.
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Nevryuzin, M.A., Lemberg, B.T. New methods for producing sealing surfaces on large-sized gate valves. Chem Petrol Eng 5, 965–969 (1969). https://doi.org/10.1007/BF01144171
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DOI: https://doi.org/10.1007/BF01144171