Developers of self-propelled rock picker conducting demonstrations in Sebeka area
SEBEKA -- On a field in northeast Otter Tail County, littered with field stones ranging from pebbles to volleyballs, the RP 1000 moves onward and then upward.
A curious, self-propelled contraption, it moves ahead at about 3 mph, unearthing rocks in a 20-foot width. Irregular rocks disappear into a cylindrical sieve that takes them to a conveyor and then onto a heavy-duty, high-lift box.
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