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Translated from Izmeritel'naya Tekhnika, No. 1, pp. 33–34, January, 1973.
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Spivak, A.V., Golubets, G.M. Precision level with internal apex angle in the measuring plane. Meas Tech 16, 49–51 (1973). https://doi.org/10.1007/BF00816682
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DOI: https://doi.org/10.1007/BF00816682