TRAVAUX PUBLICS, TRACTEUR, BULLDOZER, GRUE, ROUTE: "COPROVIA" Patented in all Countries, London, 1928. Plaquette in-8, 24 pages, photos. John Deere Bulldozers MC-60, MC-1000. CATERPILLAR Farm Tractors, Diesel Power: deux catalogues. WELLMAN SMITH OWEN ENGINEEERING, London. Catalogue in-4, 20 pages, 40 illustrations.