The Andreas Stihl manufacturing company produced light farm tractors in Germany from 1949 until 1965. Stihl was looking to take advantage of a strong post-war demand for tractors. The tractors used a Stihl two-cycle air-cooled diesel engine and ranged from about 12 to 30 horsepower.
Stihl - official site
Stihl Diesel - information on Stihl tractors (German)