According https

According https://www.bls.gov/bls/naics (2017) “NAICS uses a production-oriented conceptual framework to group establishments into industries based on the activity in which they are primarily engaged. Establishments using similar raw material inputs, similar capital equipment, and similar labor are classified in the same industry. So, establishments that do similar things in similar ways are classified together. NAICS’s industry classification for Minnesota Micromotors, Inc. MM) which is 335312, Motor and Generator Manufacturing, which is primarily compiled of manufacturers of electric motors such as generators.