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| Bell laboratories | |||
| Bell laboratory | |||
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贝尔实验室 : 18 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 9 |
| General | 1 |
| Geophysics | 1 |
| Space | 2 |
| Telecommunications | 2 |
| United States | 1 |
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