Burroughs Duplex Subtractor

Burroughs Duplex Subtractor

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This black full-keyboard printing adding machine has 13 columns of black and white round plastic keys above an unpainted steel keyboard. On the right of the number keys are a variety of function keys. One column of these refers to register 1, the other to register 2. In back of the keyboard is a wide carriage, with a place for a paper tape. On the top are two sliding steel markers, one missing a piece. No cord or handle.
A red paper tag attached to the machine reads: PATENT DEPT. (/) #176. A metal tag with the object reads: B.A.M.CO. (/) MODEL (/) NO 1020. The machine is marked on the front: Burroughs. The mark has a hook over the “g” in Burroughs. A paper sheet received with the machine reads: Do not depress Register #1 motor (/) bars while operating machine as Register (/) wheels do not shift properly and machine (/) will lock on half cycle. A metal tag attached to the object reads: DONATED TO (/) The Smithsonian Institution (/) by (/) Burroughs Corporation.
The machine is associated with Burroughs inventor Ernst Racz. It was model #176 in the collection of the Patent Division of Burroughs Corporation.
Currently not on view
Object Name
adding machine
date made
ca 1940
Burroughs Adding Machine Company
place made
United States: Michigan, Detroit
Physical Description
plastic (overall material)
paper (overall material)
metal (overall material)
overall: 27.6 cm x 49 cm x 38.5 cm; 10 7/8 in x 19 9/32 in x 15 5/32 in
ID Number
catalog number
accession number
Credit Line
Gift of Burroughs Corporation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History
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