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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 10, pp. 34–35, October, 1969.
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Lebedev, N.N. Two-position welder for surfacing sealing surfaces of steel accessories. Chem Petrol Eng 5, 814–816 (1969). https://doi.org/10.1007/BF01153181
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DOI: https://doi.org/10.1007/BF01153181