[zokier]

The introduction section of Ming Kwai typewriter patent is interesting reading (in addition to the classic beautiful drawings): https://www.google.com/patents/US2613795

The concept looks like it should be applicable to computer keyboards, and especially virtual touchscreen ones. Heck, I'm half-curious to prototype such myself just to see how it works.

[astrodust]

That thing looks impressively if not fiendishly complicated.

That seems like it's not an overtyping system, but one of selecting a single character based on a series of keystrokes.