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 Drei Schwenkpfluege im Vergleich \ Top agrar : das Magazin für moderne Landwirtschaft. Ausgabe SR [Artikel]
Gruber, W. \ 1993
De eigenschappen van de Howard Swing-plow, de Krone Allround en de Lemken Rodonit
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 Grondbewerking : Drie zwenkers : eerste ervaringen met zwenkploegen \ Akkerbouw : tweewekelijks vaksupplement van Boerderij [Artikel]
Gruber, W. \ Hammink, H. \ 1993
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