C-4 Boiler, Hot Water Heating and Steam-Fitting

C-54 Ceramic and Mosaic Tile

General Building (B)

General Engineering (A)

C-27 Landscaping

C-34 Pipeline

C-36 Plumbing

C-42 Sanitation System

C-43 Sheet Metal

C-46 Solar

C-53 Swimming Pools

C-55 Water Conditioning