The data published with NAICS code 334518 include the following SIC industries:
3495 Wire springs (pt)
3579 Office machines, n.e.c. (pt)
3873 Watches, clocks, and watchcases
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 334518 do not include establishments primarily engaged in the manufacture of electronic chronometers or watch jewels. The NAICS definitions will be fully implemented with the 2002 Economic Census.