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| cryptophony | |||
| secret telephone | |||
| secure telephone | |||
| code phone; secret telephone (机) | |||
| cipher telephone | |||
| 保密 电话: 16 phrases in 6 subjects |
| Aviation | 1 |
| Electronics | 4 |
| Space | 5 |
| Technology | 4 |
| Telecommunications | 1 |
| United States | 1 |
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