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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 8, p. 25, August, 1978.
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Zimin, V.V. Accuracy of producing ball valve balls. Chem Petrol Eng 14, 730–731 (1978). https://doi.org/10.1007/BF01155985
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DOI: https://doi.org/10.1007/BF01155985