Literature cited
N. F. Delyunov and I. L. Sakin, Author's Certificate No. 158081, Bulletin of Inventions No. 20 (1963).
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Translated from Izmeritel'naya Tekhnika, No. 1, pp. 19–21, January, 1967.
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Delyunov, N.F., Danilevich, F.M. & Nikitin, V.A. Precision cathetometer KM-9. Meas Tech 10, 24–26 (1967). https://doi.org/10.1007/BF00979877
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DOI: https://doi.org/10.1007/BF00979877