Here you go, if you're curious, but the power supply is definitely custom. It's an Osaka Vacuum Turbo-molecular pump controller. There are four boards, one for power distribution/fusing, one for power supply and three-phase AC motor drive, one for digital controls monitoring temp switches, run-time and etc and another for the display and pushbutton controls.
I traced pieces of it. The power supply board you see pictured has 14 silicon devices. Two are half-bridge diodes, collectively the full bridge rectifier, near the blue electrolytics. That's the extent of the high voltage supply, this is directly distributed to the 12 H-bridge transistors. When the power supply is at full power, there is a +200VDC supply and a -200VDC supply. H-bridge switching doubles that to 800 VDC total to control the 40kRPM+ three-phase motor in the turbomolecular pump.
On the power distribution board, the hot leg of the 120VAC power input goes through a 33 ohm 5 watt power resistor out to the rectifier circuit. A 12VDC relay bypasses the 33 ohm resistor so that it's not in circuit anymore - confusing at first, but probably designed as a safety so that if the 12VDC circuit doesn't ramp up AC power gets cut off when that 33 ohm resistor burns out (not designed for full power, drops 110 VAC). That would make sure that the other 12VDC safety relays are operable all the time. That resistor was burned up - my first clue. I replaced it and it burned up again. I removed it again and replaced with a 100W rheostat and slowly ramped up voltage to around 20VAC until I noticed the trafo smoking.
I found that website in the meantime, that they merged with NEC. Do you have any ideas about what product category this may be in?