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https://www.noaa.gov/media/digital-library-photo/pl23fizh0299jpgDescription
A harrow adapted for underwater use to cover oyster drills and other enemiesof commercial mollusks with a layer of bottom deposit. This method ofmechanical control of drills is being widely tested in Long Island Sound.Outside of establishment of Mansfield and Sons. (Image credit: NOAA Central Library Historical Fisheries Collection)