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Translated from Khimicheskoe i Meftyahoe Mashinostroenie, No. 4, p. 5, April, 1986.
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Fedorenko, N.D., Rukhlov, Y.L., Korolev, S.K. et al. Ball valve with monolithlc casing and polyurethane seal. Chem Petrol Eng 22, 124–125 (1986). https://doi.org/10.1007/BF01149235
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DOI: https://doi.org/10.1007/BF01149235