The data published with NAICS code 327331 include the following SIC industry:
3271 Concrete brick and block
This definition comes from the 1997 NAICS manual. However, for this industry, the 1997 Economic Census Manufacturing did not fully implement the conversion to NAICS. Data for NAICS industry 327331 do not include establishments primarily engaged in the manufacture of slumped brick. The NAICS definitions will be fully implemented with the 2002 Economic Census.