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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 7, p. 33, July, 1979.
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Lamdon, É.A. Countersink for finish machining of central openings. Chem Petrol Eng 15, 549 (1979). https://doi.org/10.1007/BF01175382
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DOI: https://doi.org/10.1007/BF01175382