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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 8, p. 31, August, 1969.
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Chernobrovkin, F.P. Check valves for urea synthesis columns. Chem Petrol Eng 5, 643 (1969). https://doi.org/10.1007/BF01833030
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DOI: https://doi.org/10.1007/BF01833030