as a machinist, i'm always interested in equipment like that.
thanks for the description of that machine.
when i first started my career, the company was Rockwell International. there was an in-floor Bullard vertical mill with a 5 foot table we used to machine 6 foot long gas meter bodies used in the field pipe lines.
these bodies were stood on end, one end machined, then inverted to machine the other.
after a few years, that machine was retired, and an above ground Bullard vertical mill was used until around 1978 or so, when that operation was switched over to the first of the large CNC machines were bought to machine large castings.