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Yu. V. Valuev, V. N. Sutyagin, A. A. Goroshkov, and A. I. Kuz'min, Inventors' Certificate No. 289188; Otkrytiya, Izobreteniya, Promyshlennye Obraztsy, Tovarnye Znaki, No. 1, (1977).
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 6, p. 36, June, 1977.
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Valuev, Y.V., Sutyagin, V.N., Kuz'min, A.I. et al. Device for the assembly and tack welding of the sections of drilling bits. Chem Petrol Eng 13, 553–554 (1977). https://doi.org/10.1007/BF01144324
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DOI: https://doi.org/10.1007/BF01144324