 A related conjecture by Michael Fellows, now solved, concerns planar "emulators", a generalization of planar covers that maps graph neighborhoods surjectively rather than bijectively.The graphs with planar emulators, like those with planar covers, are closed under minors and Y-Δ transforms.In 1988, independently of Negami, Fellows conjectured that the graphs with planar emulators are exactly the graphs that can be embedded into the projective plane.