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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 7, pp. 39–40, July, 1979.
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Vorob'eva, T.A., Dubko, G.V. & Varenov, A.I. Use of tungstenless hard alloys for the safety valves of drilling pumps. Chem Petrol Eng 15, 563–564 (1979). https://doi.org/10.1007/BF01175387
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DOI: https://doi.org/10.1007/BF01175387