need motor specs

Hi,

I have a retrofit customer that has a Tree CNC mill. I'm not
sure he even knows what the original control was, he only has
the mill itself. The motors are labeled Control Systems Research
(Pittsburg, PA) model SD150, Ser. 77-320. I can't find any references
to this company, but did find one outfit that referenced it to
Indiana General. (Which I can't find any trace of, either.)

So, does anyone know what the specs on this motor might be?
Or, any pointers to info on either of these companies, or old
specs, etc. ?

Thanks much for any help you can offer!

Jon