11. The " Fiat 60 " crawler tractor , replacing the old Fiat 50 models, was launched in 1956. 12. After World War II, rural municipalities equipment such as crawler tractors , scrapers and graders could be purchased. 13. The "'Linn tractor "'is a heavy duty civilian half-track or crawler tractor invented by Holman Harry Linn. 14. The "'Caterpillar Sixty "'was a crawler tractor manufactured by the Caterpillar Tractor Company from 1925 until 1931. 15. Although the total sales volume in crawler tractors fell 5 . 1 per cent, the company's profitability increased. 16. The Dorman 4JO engines was also used in the new model 1922 40 hp Clayton & Shuttleworth'chain-rail'crawler tractors . 17. The UT6, built as a smaller version of the UT4, became the basis, in 1936, for the C35 a crawler tractor . 18. After the war they exploited this to develop a civilian crawler tractor that could be sold for the peacetime reconstruction work. 19. In the same year, the company also launched the " Fiatagri 180-55 " crawler tractor , with a revolutionary hydrostatic transmission system. 20. The elements are a M970 refueling truck and a Medium Crawler Tractor bulldozer, at the end of an AM-2 airfield matting runway.
