A company left behind a 1996 two group Elektra Maxi in our building.

I'm not a barrista/espresso machine person by any means - I'm trying to identify it so I can get the right docs and check out, maybe rebuild it.
(I do have a lot of experience with machinery, so that's not a problem)

But I don't get how Elektra identifies their machines.

For example, what means "Art. T" ??
-- Is that a subgroup of the Maxi model line ? (or vice versa )
-- And so all models have a T1, T2, and T3 option ?

Or,

-- Was "T" replaced and eventually superseded by T1, T2, etc.

-- And, I guess Maxi is a model, not a series ?

If someone could provide a quick explanation of the taxonomy that would be great !