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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 9, p. 38, September, 1971.
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Daen, I.I., Malyi, N.P. & Pykin, I.I. Unit for the automatic submerged arc welding of the internal joints of shells. Chem Petrol Eng 7, 822–823 (1971). https://doi.org/10.1007/BF01143314
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DOI: https://doi.org/10.1007/BF01143314