Mostly used WC class codes:
Auto Gas Station: 8324
Auto Service Station: 8387
Auto Repair Shop: 8389
Auto Body Shop: 8393
Breweries: 2121
Bottling: 2163
Boat Dealer: 8057
Cabinet Wood Mfg: 2812
Carpentry: 5697, 5645, 5432, 5403
Concrete or Cement Work: 5201, 5205
Fish, Seafood Mfg: 2113
Furniture Moving: 8293
Electrical work: 5140
Excavation: 6218, 6220
Janitorial Service: 9008
Landscapers: 0042
Laundries: 2585
Machine Shop: 3632
Nail Hair Salon: 9586
Nurseries: 0005
Office Work: 8081
Painting: 5474, 5482
Plumping: 5183, 5187
Printing: 4299
Physicians: 8834
Retail: 8017
Restaurant: 9097
Roofing: 5552, 5553
Sheet Metal Work: 5538
Tile (or Stone, Mosaic, Terrazzo work): 5348
Trucking: 7219
Warehouse: 8292
Wallboard Application: 5446, 5447
Wholesale: 8018