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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 10, p. 29, October, 1995.
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Potemkin, G.Y. All-purpose adjustable instrument for cutting apertures. Chem Petrol Eng 31, 568–569 (1995). https://doi.org/10.1007/BF01147173
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DOI: https://doi.org/10.1007/BF01147173