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Tractor demographics for demonstrator retrofits.
| New York | Virginia | ||
|---|---|---|---|
| Tractor model: | Ford 3000 | n = 4 | n = 15 |
| Ford 8N | n = 8 | n = 1 | |
| Massey Ferguson 135 | n = 6 | n = 5 | |
| Ford 4000 | n = 7 | n = 4 | |
|
| |||
| Average tractor age by model year | 1962 | 1970 | |
| Median tractor age by model year | 1967 | 1970 | |
|
| |||
| Tractor age range | 1937 Ford 8N to 1974 Ford 4000 | 1952 Ford 8N to 1977 Ford 4000 | |
