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| système à impulsions | |||
| procédé à émission pulsée d'ultrasons; système par impulsions | |||
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pulse system : 11 phrases in 6 subjects |
| Coal | 1 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 4 |
| Mechanic engineering | 1 |
| Telecommunications | 3 |
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