Okay, so, maybe that's bunk. It seems they made really big round machinery thingies, at least in the 1920s. A successor company still seems to be out there, now called Converteam (hmm... wonder if any branding consultants were involved). And the building isn't actually empty having been converted to office/studio space like a number of other old factories in the area (more to come).
The company was founded in 1891 as a service shop before moving into manufacturing and designing custom-engineered motors and generators. It seems to me that they make big custom motors for big industrial processes.