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1930 Vermont Marble 1936 Inco Nickel Co. 1939 International Diesel Tractor #1 1939 International Diesel Tractor #2 1943 International Harvester 1945 Air Reduction Welding 1945 Caterpillar Modern Freeway 1948 Caterpillar Diesel Bulldozer 1948 Caterpillar Diesel Tractor 1949 Caterpillar Diesel Tractor #1 1949 Caterpillar Diesel Tractor #2 1949 Caterpillar DW10 Tractor 1949 Dominion Bridge Company 1950 International Crawler 1951 Allis Chalmers Motor Grader 1951 American Iron & Steel 1951 Caterpillar Diesel 1951 Caterpillar Diesel 1951 International Diesel Crawler 1952 Caterpillar Snow Plow 1953 Caterpillar 1953 GM Diesel Excavator 1953 Kennecott Copper Mines 1953 United States Steel #1 1953 United States Steel #2 1954 Allis Chalmers Scraper 1954 Caterpillar Snow Plow 1955 Dominion Bridge Co. 1955 Hough Payloader 1955 International Bullclam Tractor 1955 International Canso Causeway 1955 Murray Registered Roof 1955 Payloader Tractor Shovel 1956 Orangeburg Pipes 1957 Asphalt Institute 1957 Atomic Power Plants 1957 Kaiser Aluminum Dome 1960 Portland Concrete Highways
