Study of spatial hinge mechanisms and their use in agricultural machines Alexander P. Mudrov, Alexander G. Mudrov, Sergey M. Yakhin, Nail Z. Mingaleev and Gennady V. Pikmullin BIO Web Conf., 17 (2020) 00012 Published online: 28 February 2020 DOI: 10.1051/bioconf/20201700012