Aside from the Geiger Counter, which I describe to people who ask about it as "Nine Inch Nails in a box", I've always thought of the ZVex Machine or Death by Audio Octave Clang when I hear those bass lines.
But, just to be a pain, and since ILF is the definition of fuzz excess, I'm going to say:
Boss LS-2(or other paralell looper) Loop 1:Geiger Counter, Loop 2:Octave Clang