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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 60–61, February, 1969.
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Malkin, V.V., Borisov, A.A. Electric shaft furnace for nitriding hollow machine parts. Met Sci Heat Treat 11, 143–144 (1969). https://doi.org/10.1007/BF00652284
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DOI: https://doi.org/10.1007/BF00652284