Anyone know anything about this dinosaur? (TIG)

Looks like a Miller rebadged
Down the bottom arc intensity would probably be high frequency intensity
the phase control may be penetration one way cleaning effect the other
It is set up for a water cooled tig torch normally when used over 150 Amps for head repair & such
Bottom plug would be for tig trigger
The knob at the top looks to be arc force softer & harsher
The 2 solinoids at the bottom would be 1 for water the other for argon or whatever tig gas you use
I would say it is definetly tig as the bottom conductors would not be big enough to support spot welding
Maybe get an electrician to run a megger test on it otherwise you could find it has moisture in the windings the hard way