ɪn noʊvˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈaɪv, ɐ pɹˈoʊɾoʊtˌaɪp ʌvðə zˈɛɾɚ zˈiː twˈɛnti fˈaɪv tɹˈæktɚ wʌz pɹədˈuːst, ðə nˈeɪm zˈɛɾɚ, wˌɪtʃ wʌz meɪntˈeɪnd tə ðɪs dˈeɪ, kˈʌmz fɹʌmðə wˈɜːdz "zˈɛt" ðə pɹəklˈeɪmd fˈɜːst lˈɛɾɚɹ ʌvðɪ ˈɑːɹmɚɹi ænd "ɔːɹ" ðɪ ˈɛnd ʌvðə wˈɜːd tɹˈæktɚ.
In November 1945, a prototype of the Zetor Z-25 tractor was produced, the name Zetor, which was maintained to this day, comes from the words "Zet" (the proclaimed first letter of the armory) and "or" (the end of the word tractor).