SEBEKA, Minn. -- On a field in northeast Otter Tail County, Minn., littered with field stones ranging from pebbles to volleyballs, the RP 1000 moves onward and then upward. A curious, self-propelled ...
ANOKA, Minn. — Kent Roessler, who farms north of Anoka, says picking rocks is fun with his invention. Based on an idea by his then-four-year-old son, Roessler has created the ROBO Rock Picker. It's a ...
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