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| |||
| miniature valve with pressed-glass base | |||
| small-button glass tube | |||
| bantam tube; miniature tube; miniature valve; small-button bantam tube | |||
| пальчиковая лампа: 8 phrases in 4 subjects |
| Automated equipment | 1 |
| Electrical engineering | 4 |
| Mass media | 2 |
| Technology | 1 |