The C column comes from the rotary dial pattern -
but only VI-C mimics the counter-clockwise number
layout of the rotary dial (the dial was pulled clockwise
and rotated counter-clockwise to make the on/off-hook
clicks to dial.)
Were these C/circle layouts early skeuomorphics,
or included as several 'duck' alternatives?
(included but intended to be rejected).
II-A and VI-B appear to be the same layout, but one has a "significantly
shorter keying time" and the other is "significantly more preferred"
Honest error in duplication, or pushing a desired result?
