| item | description | category | filter | more on... |
| DTMF | Data Tone Multiple Frequency | Uncategorized |
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| DTMF | Dual Tone Multi Frequency | IT/Networking |
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| DTMF | Dual Tone Multi Frequency | Governmental/Military |
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| DTMF | Dual Tone Multi Frequency | Medical/Physiology |
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| DTMF | Dual Tone MultiFrequency | Uncategorized |
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| DTMF | Dual Tone Multiple Frequency | IT/Telecom |
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