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Mel Aho, a native of Sebeka area, who lives near Vancouver, Wash., led development of a self-propelled rock picker that can dig field rock at about 3 mph and dump 10 yards of field rock in about 8 minutes. (Mikkel Pates/Forum Communications Co.)

Developers of self-propelled rock picker conducting demonstrations in Sebeka area

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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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