double current
| key
| double current | |
| tech. | Doppelstrom |
| key | |
| gen. | Chiffre; Keil; Passfeder; Taste; Tonart; Klappe |
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| Doppelstrom m | |||
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double current : 4 phrases in 2 subjects |
| Communications | 3 |
| Metallurgy | 1 |