Fourth from the bottom looks like a Nan Tan laptop.
Several years ago, I hit the jackpot and foolishly chose not to buy it. I found one with an FCC ID of something like "FMA330", and I've just noticed something — look at the writing on Sandy's keyboard PC:
"NTC 3301C 71-…"
So yes, the one I saw was likely the Nan Tan 3300, FCC ID FMA3300.
However, the one depicted has a different style of keyboard to the FMA3300: caps lock is not stepped and there are no integrated LEDs.
So, I can't say what keyboard it has. Some laptops virtually identical to that definitely do have Alps ultra low profile mechanical switches. The one I found, the keycaps came off readily and I saw the switch in person. I should have bought it just for its immense rarity. I can't even describe the switches, other than that they seemed very light.
That one though, seems to be a rubber dome, actually, looking at it more closely.
I've asked a couple of owners of similar machines ages ago to check their machines to see if they also have Alps switches, and neither of them ever bothered. I was only thinking the other day that I need to find some more people to ask, but I guess it's irrelevant now as Sandy's keyboard has the same model number on it that I think I saw. This was at a radio rally, and I always went expecting to buy keyboards, but I started seeing items too large to buy and hadn't been prepared ready to write down any information. I simply attempted to memorise the FCC ID, and I forgot part of it.
Of the other three pieces of equipment I saw, one was a Siemens luggable I've never found, but the switches I now feel sure were STB 21. One keyboard, for this Borg cube size/shape video titling computer, had small black cube-shaped reed switches that I figure were from FR Electronics since those have recently been discovered. Finally one had what I thought was a hollow square mount centre-lit version of what we now know as T-5 series — I do have an illuminated version but it's not the design I remember seeing!
All other computers in that gallery are likely to be rubber dome or scissor.