| http://www.w3.org/ns/prov#value | - The tractor of claim 8, wherein the disengagement mechanism comprises: a preloader having first and second ends, the first end adapted to rotate about an axis at a different rotational speed than the second end; a bearing cage; a toothed wheel, wherein said first end supports the toothed wheel and engages the bearing cage; a pawl, wherein said second end supports the pawl such as to allow the pawl
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