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| DTMF (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
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DTMF : 1 Phrase in 1 Thematik |
| Kommunikation | 1 |
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| DTMF (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
|
DTMF : 1 Phrase in 1 Thematik |
| Kommunikation | 1 |