Kartoffelvollerntemaschine = potato combine.

Comparing the two terms reveals a classic divide between American pragmatism and the German passion for linguistic and mechanical over-engineering.

In Germany, a machine isn't just a tool; it's a declaration of order. While an American might be satisfied if the machine "combines" the steps, a German needs to be linguistically certain that the harvest is being performed fully (voll) and by a machine (maschine)