Allis-Chalmers D17 stone box

A rock box mounted on the side of an Allis-Chalmers D17

A rock box, sometimes known as a stone box, is a platform that mounts to the front or sides of a tractor suitable for loading rocks onto and which also provides front end ballast for the tractor. Some have hydraulics for unloading them easily from on the tractor. There is actually a patent on a rock box as an agricultural technology for tractors. [1]

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