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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 12, p. 44, December, 1970.
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Zibert, G.K., Akav, A.E., Arutyunov, É.A. et al. Rig for maintenance and inspection work on inner surface of spherical tanks. Chem Petrol Eng 6, 1066–1067 (1970). https://doi.org/10.1007/BF01151651
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DOI: https://doi.org/10.1007/BF01151651