A root crop harvester 8 (Figure 2) includes a preliminary topping device 13 followed by a topping assembly 11. Assembly 11 comprises a transversely disposed rotary device 18 including a number of skewed crown-engaging cutter bars 108 for removing skin from the crowns of crop partially topped by device 13. The topping assembly 11 is followed by a lifting device 12 for the topped crop. In alternative embodiments, the skewed straight edged cutter bars 108 are replaced by less skewed or axially parallel cutter bars having their cutter edges shaped so as in operation of the device to give the same effect as bars 108.
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