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| Preferred Term | Alternative Term(s) | Broader Concept | Illustration |
|---|---|---|---|
| Hydraulic Structures | - | Structures | - |
| hydraulic turbine | - | turbine | - |
| hydria | - | water jar | - |
| hydrodynamometer | - | Mechanical Measurement Equipment | - |
| hydrofoil | - | planing vessel | - |
| hydrogenation comparator | - | laboratory comparator | - |
| hydrometer | - | densimeter | - |
| hydrophore | - | Chemical Testing Devices | - |
| hydroplane | - | planing vessel | - |
| hydrostatic release unit | - | watercraft component | - |
| hydrostatic test pump | - | pump | - |
| hyfrecator | - | surgical instrument | - |
| Hygiene Objects | - | Toilet Articles | - |
| hygrograph | - | hygrometer | - |
| hygrometer | hydroscope; hygrophant | Meteorological T&E (blank subclass) | - |
| hygrothermograph | - | Meteorological T&E (blank subclass) | - |
| hymn board | - | Religious Objects | - |
| hymnal | hymn book | Religious Objects | - |
| hypodermic needle | - | injection needle | - |
| hypsometer | steam boiler manometer | Thermal T&E (blank subclass) | - |
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