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Here is a video of the Add-O-Matic from 1947. I found out some new info from looking through online archives. Behind the sales company was the manufacturer United Enterprises Inc from Chicago. They made stainless steel cutlery, but also some other surprising things. (1/3) youtu.be/Uhhk94cbZ0A

They may have first diversified into making glow-in-the-dark gardenias (worn as broches or hair decorations) but there was too little proof of this to include in the video. They then made this adding machine, and lastly began selling rat poison! (2/3)

By the way, the Add-O-Matic from Chicago (1947) should not be confused with the Add-O-Matic from Chicago (1937). They are completely unrelated adding machines. (3/3)