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.
Mercury Vapor Turbines.
Possible NAICS Codes
333611 – Turbine and Turbine Generator Set Units Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
335313 – Switchgear and Switchboard Apparatus Manufacturing
333618 – Other Engine Equipment Manufacturing
339991 – Gasket, Packing, and Sealing Device Manufacturing