| 1621 | Hydrogen | Company Product |
| 1622 | Hydrogen Analysers | Company Product |
| 1623 | Hydrogen Chloride | Company Product |
| 1624 | Hydrogen Gas Distributors | Company Product |
| 1625 | Hydrogen Gas Manufacturers | Company Product |
| 1626 | Hydrogen Generators | Company Product |
| 1627 | Hydrogen Peroxide | Company Product |
| 1628 | Hydrogen Pressure Regulators | Company Product |
| 1629 | Hydrogen Sulfide Analysers | Company Product |
| 1630 | Hydrogen Water | Company Product |
| 1631 | Hydrographic Surveyors | Company Product |
| 1632 | Hydrojetting | Company Product |
| 1633 | Hydrojetting Equipment | Company Product |
| 1634 | Hydrojetting Equipment Rental | Company Product |
| 1635 | Hydrometers | Company Product |
| 1636 | Hydrophilic Waterstop | Company Product |
| 1637 | Hydrophore Package Unit | Company Product |
| 1638 | Hydrophore Systems | Company Product |
| 1639 | Hydroponics | Company Product |
| 1640 | Hydroquinone | Company Product |
| 1641 | Hydrostatic | Company Product |
| 1642 | Hydrostatic Pressure | Company Product |
| 1643 | Hydrostatic Pressure Transmitter | Company Product |
| 1644 | Hydrostatic Release Units | Company Product |
| 1645 | Hydrostatic Sensors | Company Product |
| 1646 | Hydrostatic Transmissions | Company Product |
| 1647 | Hydrotest Pumps | Company Product |
| 1648 | Hydroxyethyl Acrylate | Company Product |
| 1649 | Hydroxyethyl Cellulose | Company Product |
| 1650 | Hydroxylamine Hydrochloride | Company Product |