This tractor was the Holt 15 ton tractor.

Benjamin Leroy Holt invented the caterpillar tractor. he was born January 1st 1849, and he died December 5th 1920. he was an american, and he founded Caterpillar inc., Holt manufacturing Company.

the first Caterpillar tractor was made in the 1890's. The Caterpillar tractor company had its origins in two California based agriculture-equipment companies. The founders were named Charles Holt and Daniel Best.

he manufactured the first practical crawler-type tread tractor. he tested the gasoline-powered Caterpillar prototype in Mormon Slough, Stockton, California in 1906.