I've not found a ton on the company behind the signs, but here is an interesting article from the Downtown Journal (via Writing on the Wall) from 2004. It's primarily about the building's then (and current?) owner, who at the time promised to preserve the building without renovation for some time. It looks like he's kept that promise. I was surprised, though, at the implication that the foundry apparently was in operation until 1979, when the gentleman in the profile purchased the building.
Apparently a commutator is a type of switch for certain types of motors. It's also a mathematical term (that I don't understand). I'll leave it to you to decide which inspired the name. I'll also leave you with one last shot:
You can find them all at 125 1st St. N.