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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 8, p. 34–35, August, 1979.
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Rasi-Zade, A.T., Frenkel', B.O. & Boltunov, F.F. A securing device for the jaws of a preventer. Chem Petrol Eng 15, 635–636 (1979). https://doi.org/10.1007/BF01174849
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DOI: https://doi.org/10.1007/BF01174849