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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 12, p. 3, December, 1970.
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Ramazanov, R.A., Kakhramanov, K.T. & Razzhivin, V.I. Results of full-scale industrial tests on wellhead through-flow gate valves. Chem Petrol Eng 6, 986–987 (1970). https://doi.org/10.1007/BF01151621
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DOI: https://doi.org/10.1007/BF01151621