Gaston Dufour 220, 221, 211N and 221R  Milling Machines: Operator's Instruction and Maintenance with Parts as Exploded Component Drawings and an Electrical Schematic. Gaston Dufour 220, 221, 211N 7 221R. Milling Machine: Operator's Instruction and Maintenance with Parts as Exploded Component Drawings and an Electrical Schematic.