| 1681 | Tuning Fork | Company Product |
| 1682 | Tuning Forks | Company Product |
| 1683 | Tunnel | Company Product |
| 1684 | Tunnel Boring Equipment | Company Product |
| 1685 | Tunnel Boring Equipments | Company Product |
| 1686 | Tunnel Boring Machines | Company Product |
| 1687 | Tunnel Concrete Mixer Systems | Company Product |
| 1688 | Tunnel Fans | Company Product |
| 1689 | Tunnel Mixers | Company Product |
| 1690 | Tunnel Protection | Company Product |
| 1691 | Tunnelling Contractors | Company Product |
| 1692 | Tunnelling Equipment | Company Product |
| 1693 | Turbidimeters | Company Product |
| 1694 | Turbidity Controls | Company Product |
| 1695 | Turbidity Meter | Company Product |
| 1696 | Turbidity Meters | Company Product |
| 1697 | Turbidity Sensor | Company Product |
| 1698 | Turbidity Sensors | Company Product |
| 1699 | Turbidity Suspended Solids Analyzer | Company Product |
| 1700 | Turbine | Company Product |
| 1701 | Turbine Bypass | Company Product |
| 1702 | Turbine Casings | Company Product |
| 1703 | Turbine Drive Generators | Company Product |
| 1704 | Turbine Flowmeter | Company Product |
| 1705 | Turbine Flowmeters | Company Product |
| 1706 | Turbine Meters | Company Product |
| 1707 | Turbine Pumps | Company Product |
| 1708 | Turbine Repair | Company Product |
| 1709 | Turbine Seal-Steam Control | Company Product |
| 1710 | Turbine Ventilator | Company Product |