Massey-Harris built early tractor models .
Massey-Harris built models including the Massey-Harris GP , Massey-Harris Pacemaker , Massey-Harris Pony , Model 20 , Model 81 , Model 101 , Model 744Massey-Harris revolutionized grain harvesting in 1938 with the world 's first self-propelled combine - the No .
Massey Ferguson