Were the only differences between the John Deere 140 H1 and H3 the number of hydraulic levers? Is there something different too with the number of hydraulic ports? Also was there a 140 H2?

120 Tractors: 1970 = (          - 7,500) 1971 = (7,501 -          ) Identification Code: T0571 = Green Tractor T0572 = White Tractor K301AS 12hp Kohler  140 Tractors: 1968 = (            - 10,000) 1969 = (10,001 - 22,400) 1970 = (22,401 - 30,000) 1971 = (30,001 - 38,000) 1972 =...