Thanks for the heads up!
Very welcome.
The Mitsumi version is AT/XT switchable and uses a somewhat unique type of rubber sleeves if I recall correctly. It has cylindrical sliders which themselves have no spring or rubber dome...the dome goes around the slider and pushes the keycap itself back up.
They're mush and bind easily.
MIGHT have a detail or two about the construction off a bit, it's been a while since I've even seen the thing. Photographic breakdown, anyone?