Procedure for the transformation of a tractor of only two drive wheels in a tractor with four drive wheels (Machine-translation by Google Translate, not legally binding)
ES298621A3
A method and device for converting a rear propulsion tractor to propulsion at the four wheels. (Machine-translation by Google Translate, not legally binding)
ES298622A3
A torque limiting device for transmission of the movement between two axes (Machine-translation by Google Translate, not legally binding)
GB1076241A
Improvements in or relating to transmission gearing for tractors
GB823836A
Front wheel driving attachment for tractors with differential box having a rear opening
GB835828A
Tractor with rear wheel drive and rear power take-off shaft provided with means for driving the front steering wheels
GB824299A
Improved means for converting tractors to four wheel drive
GB814042A
Converting a rear-wheel drive tractor to four-wheel drive
