"Tri-coil" humbucker?

[Jim Shine]

The Motherbucker contains 4 magnets. 2 wide ones on each side of the central coil and two narrow ones under the outer sides of the outer coils.

[David King]

Bartolini did make a triple coil with a dummy coil in the middle and two mag coils, one on either side. I thought it was a pretty common technique with other makers as well.