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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 9, pp. 2–3, September, 1978.
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Val'dman, I.Y., Pridanov, A.K., Val'dman, T.G. et al. 1BA15K drilling aggregate for the drilling of large-diameter wells with reverse flushing. Chem Petrol Eng 14, 780–782 (1978). https://doi.org/10.1007/BF01144864
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DOI: https://doi.org/10.1007/BF01144864