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.
Equipment and Materials Testing: Tractors
Possible NAICS Codes
532412 – Construction, Mining, and Forestry Machinery and Equipment Rental and Leasing
444130 – Hardware Stores
333923 – Overhead Traveling Crane, Hoist, and Monorail System Manufacturing
238220 – Plumbing, Heating, and Air-Conditioning Contractors