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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 11, p. 38, November, 1973.
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Polushkin, V.A. Die for punching holes in parts made from sheet material. Chem Petrol Eng 9, 1041–1042 (1973). https://doi.org/10.1007/BF01144523
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DOI: https://doi.org/10.1007/BF01144523