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| Mehrfrequenzverfahren n (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
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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 multiple-frequency : 1 phrase in 1 subject |
| Telephony | 1 |