Gleaner first built the 'R' model begining in the late 40's. They introduced the 'A' about 1950, which would handle a 12' or 14' head. These were built through the 50's, and quite a few can still be found cutting little fields in western Kansas. In 1960, Gleaner introduced the 'C', which could handle heads up to 20', with a 40" cylinder. They also introduced the smaller 'E', with 10', 12' or 13' heads. In 1964, they updated these models with the C2 and A2 models. The 'E III' was introduced in 1967 to replace the 'E'. In 1968, the 'F' replaced the 'A2', with a 38" cylinder. The 'G' model replaced the 'C II', with headers up to 23'. In 1969, the 'K' replaced the 'E III' as the smallest combine in the line. 1972 marked the introduction of the 'l', with the 48" cylinder and headers to 24'. The 'M' replaced the 'G' in 1973, using a 40" cylinder and headers to 22'. The series 2 machines were introduced in 1977, with the l2, M2, F2 and K2 models. The first Gleaner rotaries were introduced in 1978, with the N6 and N5 models. The N7 came out the next year. The series 3 conventionals were introduced in 1983, with the l3, M3 and F3 models. The smaller K machines were dropped. The R5, R6 and R7 machines were made in 1986, with the R5 continued into 1987. The two larger rotaries were replaced by the Deutz-powered R60 and R70 in 1987. The R50 replaced the R5 in 1988, and was joined by the R40, as Gleaner dropped the conventionals. Of course, in 1992, the R42, R52, R62 and R72 models were introduced. Gleaner has a long reputation of building simple, durable combines. I hope they continue that trend in the future.