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| durée des intervalles (The mean duration, expressed in milliseconds, of the gap periods that have occurred since the beginning of reception) | |||
| largeur d'entrefer; longueur réelle d'entrefer | |||
| largeur réelle d'entrefer | |||
| gap length: 5 phrases in 3 subjects |
| Electronics | 3 |
| Metallurgy | 1 |
| Sound recording | 1 |