Special trade contractors, handymen who perform construction work that's not classified elsewhere. This includes a wide range of activities, such as roof repair,  general construction, drywall, tile, framing, carpentry, installing construction materials such as ornamentation, metalwork, waterproofing, etc. 

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Examples of 1799 work 

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• Construction of athletic and recreational facilities

• Coating, caulking, and weatherproofing

• Installation of service station equipment

• Rigging and scaffolding

• Installation of awnings

• Installation of lightning conductors

• Installation of plastic wall tile

• Caulking

• Posthole digging

• Sandblasting