Lennox Industries. Yes Dave Lennox is from Marshalltown and developed his furnace there.
Fisher Governor makes governors for pipelines.
Both of these were huge employers when I grew up back there. Don't know about now.
That’s where my uncle worked - Fisher Governor - I think I said Fisher Manufacturing up thread.
He worked there in Marshalltown for a number of years and then at another location. As I recall, he was happy there and thought it to be a good company.