Dufour (Gaston Dufour) Type 52 Milling Machine Operation, Maintenance & Parts Manual Dufour (Gaston Dufour) Type 52 Milling Machine: Operator's Instruction and Maintenance Manual with Parts Manual as Sectional Drawings with Electrical Diagrams. FRENCH TEXT Manufacturers: Dufour Models: 52 Contents: Operators Manual Maintenance Manual Parts Manual