Tractor Test Files by Manufacturer
Cletrac, Cockshutt, Co-op, Choremaster, Centaur, Continental, and Corbitt Co.
1952
Test 474: Cockshutt 20*, Nebraska Tractor Test Lab
Test 487: Cockshutt 50*, Nebraska Tractor Test Lab
Test 488: Cockshutt 50 *, Nebraska Tractor Test Lab
1950
Test 442: Cockshutt 40, Nebraska Tractor Test Lab
Test 449: Choremaster B, Nebraska Tractor Test Lab