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If you like buttons... https://www.instagram.com/explore/tags/pncpanel/ …pic.twitter.com/SJfsWHBamH
Lovely image but now I am perturbed. How could IV-A possibly have a significantly shorter keying time then VI-A (as indicated by the asterisk). Given they're, you know, identical and everything...
VI-B is also identical to II-A, so I'm guessing that these are comparison test groups and group VI may be for the runoff, so to speak.
IV-A and VI-A are the same?
This is super cool and totally agree. Assume that one was significantly more preferred bc it replicated the existing rotary layout?
Whoops...no, it did not. Opposite number order.
What a remarkable decision they made
DTMF (dual-tone multi-frequency) tone dialing is kinda linked to the the keypad design: the row decides one of the tones and the column decides the second tone. That must have been an influencing factor.
V-C is the.... NOKIA 3650? 
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