> Looking for the name(s) of the a) manufacturer(s) and b) model(s) 
> of c) desktop and d) laptop computer(s) now being used by rms!

Hi, rms is using a Thinkpad X60 from Minifree [0].
You can find more info here [1].

[0]: https://minifree.org/
[1]: https://stallman.org/stallman-computing.html