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| Angielski tezaurus | |||
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| Dual Tone Multiple-Frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
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| DTMF | |||
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dual-tone : 18 do fraz, 4 tematyki |
| Elektronika | 8 |
| Komunikacja | 4 |
| Pospolicie | 2 |
| Technologia informacyjna | 4 |