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: Agricultural Machinery and Equipment
Possible NAICS Codes
333111 – Farm Machinery and Equipment Manufacturing
811310 – Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
333120 – Construction Machinery Manufacturing
238990 – All Other Specialty Trade Contractors
115310 – Support Activities for Forestry