At the Castings Division , the Granite City plant improved production efficiency .
At the Castings Division , the Granite City plant lowered its breakeven point but a strike from November 20 , 1971 to January 17 , 1972 completely halted production .
At the Castings Division , the Granite City plant improved production efficiency and lowered its breakeven point but a strike from November 20 , 1971 to January 17 , 1972 completely halted production .