MX1A-B1xx

[Daniel Beardsmore]

OK, so ...

"Type A" white appears to be the same switch as "modern" white, just modified to be different from clears.
"Type B" white appears to be the same switch as blue, just modified to be different from type A whites.

Type A (MX1A-A1nn) is given as 1987 onwards, and blue (MX1A-E1nn) has a higher letter.

The patent mentions the hysteresis/movement differential but says nothing about audible feedback.

I am guessing that Cherry originally tried to remove the sound by lube, and then decided that they would produce a parallel switch that retained its sound, while still selling the hysteresis-enabled quiet switch. Both of these were then given different colours to reduce confusion, with one changing to blue (giving clear and blue), and once clear came out, the other changing to white (giving white, blue, clear).

In effect, there would be only two switches here: white and blue, where both started out clear in colour.

Does that seem reasonable?