| Clue | Source | Date |
|---|---|---|
| Acronymic devices in atomic clocks and radio telescopes | New York Times | 03 Dec 2023 |
| Atomic clock devices | Newsday | 03 Aug 2017 |
| Atomic clock components | New York Times | 12 Jan 2017 |
| Atomic clock components | ||
| Electromagnetic wave amplifiers | ||
| Electromagnetic wave amplifiers | ||
| Electromagnetic wave enhancers | ||
| Electromagnetic wave enhancers | ||
| Generators of microwaves | ||
| Electromagnetic wave amplifiers | ||
| Devices for amplifying electromagnetic waves | ||
| Electronic devices | ||
| Microwave amplifiers. | ||
| Microwave radiation devices. |