120-inch Mill 120 refers to the nominal width of the plate that was being made in this particular mill. This mill was brought into production during the 1920's and was built next to 112; mill in order to modernize the steel mill but not disrupt operation of the 112-inch mill. The 120-inch mill had tables that were linear. It was designed so that the steel was reversed and forced back through the rollers. The larger ingots coming from the electric furnace meant larger, heavier, wider plates, which opened up new markets for Lukens Steel. This mill was more or less an extension of the 112 mill because it was the first modem set of mills and Lukens Steel set the pattern by developing the reversing process that became standard in the steel industry.