Aircraft Avionics Variable Rheostat. Manufactured by Airesearch. P/N 548158-2-1 or CM27501-2. Alternate P/Ns 140-7420, 000600966, 123SCEC111, 123SCEC111-501, 123WCEC111-501, 1660000600966, 547158-2-1, 5481582-1. NSN: 1660-00-060-0966. It was removed from a salvage aircraft.