| 1591 | Hydro-Distillates | Company Product |
| 1592 | Hydro-Jetting Equipment | Company Product |
| 1593 | Hydro-Jetting Pumps | Company Product |
| 1594 | Hydro-Jetting Services | Company Product |
| 1595 | Hydro-Jetting Specialist | Company Product |
| 1596 | Hydroblasting Ship Hull | Company Product |
| 1597 | Hydrochloric Acid | Company Product |
| 1598 | Hydrocortisone | Company Product |
| 1599 | Hydrocyclone | Company Product |
| 1600 | Hydrodynamic Coupling | Company Product |
| 1601 | Hydrofluoric Acid | Company Product |
| 1602 | Hydrogen | Company Product |
| 1603 | Hydrogen Analysers | Company Product |
| 1604 | Hydrogen Chloride | Company Product |
| 1605 | Hydrogen Gas Distributors | Company Product |
| 1606 | Hydrogen Gas Manufacturers | Company Product |
| 1607 | Hydrogen Generators | Company Product |
| 1608 | Hydrogen Peroxide | Company Product |
| 1609 | Hydrogen Pressure Regulators | Company Product |
| 1610 | Hydrogen Sulfide Analysers | Company Product |
| 1611 | Hydrogen Water | Company Product |
| 1612 | Hydrographic Surveyors | Company Product |
| 1613 | Hydrojetting | Company Product |
| 1614 | Hydrojetting Equipment | Company Product |
| 1615 | Hydrojetting Equipment Rental | Company Product |
| 1616 | Hydrometers | Company Product |
| 1617 | Hydrophilic Waterstop | Company Product |
| 1618 | Hydrophore Package Unit | Company Product |
| 1619 | Hydrophore Systems | Company Product |
| 1620 | Hydroponics | Company Product |