4Such part of any plant or any combination of plant and machinery, including gas holders, blast furnaces, coke ovens, tar distilling plant, cupolas, and water towers with tanks, as is, or is in the nature of, a building or structure.
4Such part of any plant or any combination of plant and machinery, including gas holders, blast furnaces, coke ovens, tar distilling plant, cupolas, and water towers with tanks, as is, or is in the nature of, a building or structure.