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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 5, p. 44, May, 1973.
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Brazhnikova, A.V. Harmonic-drive gear with controllable transmission ratio. Chem Petrol Eng 9, 476–477 (1973). https://doi.org/10.1007/BF01155654
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DOI: https://doi.org/10.1007/BF01155654