gru mlo lujvo

m₁ is a grain mill [building] performing process m₂.

In notes:

molki: x₁ is a mill/foundry/industrial plant/[assembly line] performing process x₂.
dzumlo: m₁ is a treadmill (industrial apparatus) performing process m₂.
jacmlo: m₁ is a watermill performing process m₂.