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https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling

66a3aDTMFpad - Public Domain

Lexlexlex - Own work

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current19:51, 19 September 2014Thumbnail for version as of 19:51, 19 September 2014640 × 480 (65 KB)Six26 (talk | contribs)https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling 66a3aDTMFpad - Public Domain Lexlexlex - Own work
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