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Translated from Izmeritel'naya Tekhnika, No. 10, pp. 74–75, October, 1978.
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Kashpar, E.I., Shchegol'kov, É.B. Optical instruments for angular measurements in engineering. Meas Tech 21, 1440–1442 (1978). https://doi.org/10.1007/BF00823092
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DOI: https://doi.org/10.1007/BF00823092