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Translated from Izmeritel'naya Tekhnika, No. 6, p. 93, June, 1974.
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Markov, P.U. Instrument to verify the perpendicularity of the outer measuring surface of a T square to a guide. Meas Tech 17, 973–974 (1974). https://doi.org/10.1007/BF00815229
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DOI: https://doi.org/10.1007/BF00815229