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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 12, pp. 34–35, December, 1968.
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Sovkin, V.F., Sopin, P.I., Zlotnikov, M.S. et al. Modernized grinders for cone bits. Chem Petrol Eng 4, 1027–1028 (1968). https://doi.org/10.1007/BF01235973
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DOI: https://doi.org/10.1007/BF01235973