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| telbuis f | |||
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| Geiger-telbuis m | |||
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counter tube : 70 phrases in 6 subjects |
| Antennas and waveguides | 1 |
| Earth sciences | 18 |
| Electronics | 19 |
| Measuring instruments | 27 |
| Natural sciences | 2 |
| Technology | 3 |
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