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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 120–122, January–February, 1969.
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Ryashentsev, N.P., Svirshchevskii, V.K. A device for core sampling from the walls of deep boreholes. Soviet Mining Science 5, 95–96 (1969). https://doi.org/10.1007/BF02501718
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DOI: https://doi.org/10.1007/BF02501718