Here is one of a few advertisements I have. This is for the Automatic Signal Corporation. There is no date on this ad from The American City. What I really like is that I went to college in Troy, NY, and walked on the streets listed many years after this photo was taken.
I tried to zoom in on the street picture. You can make out signals on the street corners.
The old ads are neat. Two years ago I stopped in Waterloo on my way to OSM, I had an Eagle ad from 1957 describing an intersection there. I traded it for some face time at the signal shop.