The RP1000 rock picker threatens to end the rock-picking jobs of youth. Developed by Mel Aho, a farmer from central Minnesota, the new RP1000 picked up enough rock to fill 175 dump-truck loads, all from a 55-acre field. It took 65 hours of machine time to complete the task.

Aho designed the original rock picker after trying to farm a 160-acre field that was strewn with stones. A friend from Washington helped him build the picker. Aho’s brother Mark is now helping to bring the rock picker to market. Mark has been in the steel erecting business.
 

http://farmindustrynews.com/product_week/rock-picker-cleans-fields-0421/