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Show Chromium Chromium has been known ns a chemical element since about 1800, when it was discovered by n metallurgist metal-lurgist named Vauquelln. Ore whs found in Maryland and Pennsylvania Pennsyl-vania In 1S27. While chromium had been used as an nlloy with steel on a considerable scale prior to that time, Its first employment In a large way is said to have been in the construction con-struction of the Ends Mississippi river bridge at St. Louis, which was completed In 1S74 and is still In constant use. |