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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

youtu.beThe Add-O-Matic adding machine (1947-1949)YouTube video by Jaap Scherphuis

26/7/26, 9:38 pm0 reposts3 likes

Jaap Scherphuis

@jaapsch.net

26 July

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)

Jaap Scherphuis

@jaapsch.net

26 July

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)

Jaap Scherphuis

@jaapsch.net

27 July

Here is my write-up of the 1947 Add-O-Matic: www.jaapsch.net/mechcalc/addomatic2.htm

jaapsch.netAdd-O-MaticMy collection of mechanical calculators. Descriptions, photos, and videos of the many calculators I have, with historical information and advertisements from the archives.