The first harvest combine Massey-Harris 20, was manufactured in 1937. It was developed for Argentina market. The Massey-Harris 21 combine which is introduced in production in 1941 was developed for the American market and was world-wide recognized, as the first commercially successful project. The Massey-Harris 21 combine was made of stainless steel and not painted, however shortage of metal forced the producer to apply usual steel.
|Speed min-max, km/h||1,6-11,25|
|Cutting width, cm||360|