File:Spectogram of all 16 DTMF tone combinations.png

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Spectogram_of_all_16_DTMF_tone_combinations.png ‎(685 × 412 pixels, file size: 220 KB, MIME type: image/png)

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current12:37, 10 April 2017Thumbnail for version as of 12:37, 10 April 2017685 × 412 (220 KB)MarcusValentine (talk | contribs)

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