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| 应答信标 | |||
| 无线电应答器信标 | |||
| 应答无线电信标 | |||
| 无线电应答信标 | |||
| 应答式无线电指向标; 应答机信标; 应答式无线电信标; 应答器信标 | |||
| transponder beacon: 8 phrases in 5 subjects |
| Air defense | 1 |
| Electronics | 2 |
| General | 1 |
| Space | 2 |
| Technology | 2 |
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