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.
Dredges, without Hull; Ocean-Going Dredges; Floating Dredges.
Possible NAICS Codes
336611 – Ship Building and Repairing
237990 – Other Heavy and Civil Engineering Construction
333120 – Construction Machinery Manufacturing
332312 – Fabricated Structural Metal Manufacturing
541330 – Engineering Services
488330 – Navigational Services to Shipping
333613 – Mechanical Power Transmission Equipment Manufacturing
332999 – All Other Miscellaneous Fabricated Metal Product Manufacturing
332911 – Industrial Valve Manufacturing
331529 – Other Nonferrous Metal Foundries (except Die-Casting)