1918 Holt 45 Crawler, the forerunner of the Caterpillar tractors. It had two forward and two reverse gears with a top speed of 3½ mph. Its engine with 6" bore and a 7" stroke peaked at 550rpm. With a gross weight of 14,000 pounds this was one of the first Holt tractors built without a front tiller wheel. Seen here at the Antique Gas & Steam Engine Museum at Vista, California in August 2011. (Richard J Endericks) #1