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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 7, p. 34, July, 1980.
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Sokolova, N.G., Tashlitskii, A.I. A resetable drill device for drilling fastening holes in flanges. Chem Petrol Eng 16, 452–453 (1980). https://doi.org/10.1007/BF01155968
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DOI: https://doi.org/10.1007/BF01155968