  Quantum erasers with paths in the form of physical slits have been studied
extensively and proven instrumental in probing wave-particle duality in quantum
mechanics. Here we replace physical paths (slits) with abstract paths of
orbital angular momentum (OAM). Using spin-orbit hybrid entanglement of photons
we show that the OAM content of a photon can be erased with a complimentary
polarization projection of one of the entangled pair. The result is the
(dis)appearance of azimuthal fringes based on whether the \which-OAM"
information was erased. We extend this concept to a delayed measurement scheme
and show that the OAM information and fringe visibility are complimentary.
