|
| 1110 | Heavy oil, thermal in situ recovering | |
| 3410 | Heavy trucks, assembling on chassis of own manufacture | |
| 3410 | Heavy trucks, assembling on purchased chassis | |
| 2411 | Heavy water (i.e., deuterium oxide), manufacturing | |
| 5260 | Hedge and lawn trimmers, repair service (without retail sales of new equipment) | |
| 2893 | Hedge shears and trimmers, non-electric, manufacturing | |
| 5234 | Hedge trimmers, power, retail | |
| 2922 | Hedge trimmers, powered, manufacturing | |
| 0112 | Hedging | |
| 2899 | Heel and toe caps, metal, manufacturing | |
| 1920 | Heel caps, leather, manufacturing | |
| 1920 | Heel lifts, leather, manufacturing | |
| 1920 | Heels, boot and shoe, finished wood, manufacturing | |
| 1920 | Heels, boot and shoe, leather, manufacturing | |
| 1920 | Heels, shoe, rubber, manufacturing | |
| 5150 | Heels, shoe, wholesale | |
| 2899 | Helical springs, heavy gauge, manufacturing | |
| 2899 | Helical springs, light gauge, made from purchased wire | |
| 6220 | Helicopter carriers, freight, nonscheduled | |
| 6220 | Helicopter carriers, non-scheduled service | |
| 6220 | Helicopter carriers, passenger, nonscheduled (except scenic and sightseeing) | |
| 6210 | Helicopter carriers, passenger, scheduled | |
| 6220 | Helicopter rides, scenic and sightseeing | |
| 3530 | Helicopters, manufacturing | |
| 1110 | Helium content from natural gas, recovery of | |
| 2411 | Helium recovery from natural gas | |
| 2411 | Helium, manufacturing | |
| 3693 | Helmets, athletic, manufacturing | |
| 3311 | Helmets, space, manufacturing | |
| 7491 | Help supply service | |
| 8532 | Helping hand services | |
| 5139 | Hematinic medicines, wholesale | |
| 1310 | Hematite mining | |
| 1310 | Hematite ore mining | |
| 3312 | Hematology instruments, manufacturing | |
| 2423 | Hematology in-vitro diagnostic substances, manufacturing | |
| 2423 | Hematology in-vivo diagnostic substances, manufacturing | |
| 2423 | Hematology products (except diagnostic substances), manufacturing | |
| 2411 | Hemlock extract, manufacturing | |
| 0200 | Hemlock gum, gathering of | |
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