Burroughs Class 9 Subtractor

This model of a section of a Burroughs Class 9 adding machine has a steel mechanism in a steel framework painted brown. It has one column of black plastic number keys, and one column of red and white plastic function keys. There is part of a carriage, part of a printing mechanism, and a place for one spool of a ribbon. The mechanism is on a metal support that fits into a wooden stand. There is no cover for the sides.
The Burroughs Class 9 was introduced in 1926. This is model #241 Patent Division of Burroughs Corporation, although there is no departmental tag. A metal tag attached to the object reads: DONATED TO (/) The Smithsonian Institution (/) by (/) Burroughs Corporation.
Currently not on view
Object Name
adding machine section
date made
ca 1926
Burroughs Adding Machine Company
Physical Description
plastic (overall material)
metal (overall material)
wood (overall material)
paper (overall material)
overall: 46 cm x 25 cm x 38 cm; 18 1/8 in x 9 27/32 in x 14 31/32 in
place made
United States: Michigan, Detroit
ID Number
catalog number
accession number
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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