4 · Society, Civilization, Culture
47 · crafts and industries
47A · industrial structures
47A2 · interior of industrial structures (regardless of the materials processed or the products made
47A21 · workshop-interior
47A212 · fire, oven, furnace ~ interior of industrial structure
47A212(+1) · fire, oven, furnace ~ interior of industrial structure (+ place ~ crafts, industries, agriculture)
47A212(+12) ·
fire, oven, furnace ~ interior of industrial structure (+ outdoors; in the open air)