File:640px-66a3aDTMFpad.jpg
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640px-66a3aDTMFpad.jpg (640 × 480 pixels, file size: 65 KB, MIME type: image/jpeg)
https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling
66a3aDTMFpad - Public Domain
Lexlexlex - Own work
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:51, 19 September 2014 |  | 640 × 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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