| 2649545 | Loop antenna | |||
| 2552816 | Directional antenna system | |||
| 2538525 | Metal-case portable receiver | |||
| 2515816 | Radio apparatus | |||
| 2322126 | Loop antenna system | |||
| 2292163 | Radio receiver | |||
| 2289691 | Noise reduction system | |||
| 2256803 | Antenna system for radio receiving sets | |||
| 1589344 | Radio signaling system |
| NO55309A | ||||
| GB720225A |