hello sorry if I express myself badly but I'm Italian I would like information on excavators self-propelled "noria" or chain of cups or chain of buckets, which are used in gravel pits in mines or dredging to remove the sand from the river beds the system could noria help me with photos or illustrations or trademarks Sorici thanks I'm doing a research on these machines thanks again http://www.rohrdredge.com/pics/dredges/landbasedbucketladder.jpg
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