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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No.5, p.43, May, 1978.
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Alekseev, V.E., Lebedevich, V.I., Bystrov, N.M. et al. Improving the design of conical stopcocks. Chem Petrol Eng 14, 478–479 (1978). https://doi.org/10.1007/BF01156344
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DOI: https://doi.org/10.1007/BF01156344