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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 9, p. 4, October, 1979.
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Aliev, K.B., Alekperov, S.I., Kurbanov, M.K. et al. Direct-flow gate valves with sealing elements of new design. Chem Petrol Eng 15, 736–737 (1979). https://doi.org/10.1007/BF01176217
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DOI: https://doi.org/10.1007/BF01176217