This U.S. industry comprises establishments primarily engaged in converting paperboard into setup paperboard boxes (i.e., rigid-sided boxes not shipped flat) without manufacturing paperboard. Cross-References. Establishments primarily engaged in-- ? Manufacturing folding paperboard boxes (except corrugated)--are classified in U.S. Industry 322212, Folding Paperboard Box Manufacturing; ? Manufacturing corrugated and solid fiber boxes--are classified in U.S. Industry 322211, Corrugated and Solid Fiber Box Manufacturing; and ? Manufacturing paperboard and converting paperboard into containers--are classified in Industry 322130, Paperboard Mills.