This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Modification of Equipment: Engine Accessories
Possible NAICS Codes
541990 – All Other Professional, Scientific, and Technical Services
811210 – Electronic and Precision Equipment Repair and Maintenance
332710 – Machine Shops
238290 – Other Building Equipment Contractors