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The UR2 (Unified Range 2) tractors were a joint venture between Zetor (engineering & design) and Ursus (manufacture of heavier components e.g. back axles). The back axle of the Zetor Crystals are stamped Ursus if you look at them. Ursus made them for Zetor in the Iron Curtain days. This was because Zetor used unified production methods where different models used common parts - lean manufacturing in its infancy!
BTW the Ursus C385 is the same as a Zetor Crystal 8011.
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