Here's the other one:
SMK second generation platformI am assuming that SMK made them all.
Dell AT101 keyboards were made by Alps USA and Silitek. Here's an early AT101:
http://sandy55.fc2web.com/keyboard/dell_43197.htmlLabel confirms US manufacture. The FCC grantee (GYI) is Alps Electric (USA) Inc.
I am guessing that Alps designed the keyboard themselves for someone (Bull maybe), and when other companies approached Alps for a keyboard, they decided to purchase an existing product to save the expense of having a new keyboard designed and tooled. It's cheaper to just have your company's logo placed onto an existing product than to have a whole new keyboard designed. It's only with designs such as the banana keyboard (Micral 200/AT101/Granite) that companies don't seem to care that they're shipping a distinctive keyboard that was not their design. Apple always had custom-designed keyboard made.
I don't know how the design got moved to Silitek though — did they sell the tooling, or did Silitek retool from scratch? I know that, with the AppleDesign keyboard, the Alps and NMB versions were very similar yet clearly different, so each company had tooled up independently with separate production lines.
Also, it looks like Alps USA used salmon Alps, while Silitek used black Alps, which is curious.
Silitek's FCC IDs are weird:
GYUM90SK 06/13/1997
GYUM91SK 10/11/1995
GYUM92SK 06/26/1995
GYUM93SK 10/28/1994
GYUM95SK 02/01/1994
GYUM96SK 09/09/1993
GYUM97SK 01/09/1992
GYUM98SK 11/06/1991
GYUM99SK 04/02/1991
Looks like M for mechanical, R for rubber dome.
The earliest one used for the Dell keyboard was the GYUM97SK, from 1992, which is exactly when orange and salmon Alps were last seen. I don't know if Alps forced the decision to move production to Silitek Taiwan, or whether some decision relating to this move led to the discontinuation of salmon and orange Alps. Tactile Alps were not that common, and by 1992 Apple had moved over to the damped switches. I don't know what GYUM99SK and GYUM98SK were; Google suggests GYUM98SK does not exist, and GYUM99SK is mentioned as a "SILITED" keyboard in some motherboard manual.
By the way, I've only used bamboo blacks (no slits) in my AT102W and they suck, but it may be that pine blacks (early, with slits) are OK.
As for the double-shot keycaps — that's another mystery: who made them? The moulding style is very distinctive.