Burroughs Class 9A Adding Machine

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This full keyboard printing electric adding machine has a black steel frame with black, white, and two red plastic keys. Numbers printed are visible. The ten columns of square numeral keys, with the keys in each column numbered from 1 to 9, are to the left of the column of function keys. Right of the function keys are bars marked for addition and subtraction. The narrow printing mechanism at the back can print numbers of up to 11 digits.
A mark on the front of the machine reads: Burroughs. One on a plate under the keys reads: A550544. IA metal tag screwed to this plate reads: A305. A red paper tag attached to the object reads: PATENT DEPT. (/) #97. A tag to the right of the number keys reads: 139-286. A metal tag attached to the object reads: DONATED TO (/) The Smithsonian Institution (/) by (/) Burroughs Corporation. An electric cord extends from the back of the machine. There is a black cover. A dark brown metal plate found in the box with the machine has no apparent connection to it.
The object was model #97 in the collection of the Patent Division of Burroughs Corporation.
Currently not on view
date made
Burroughs Adding Machine Company
place made
United States: Michigan, Detroit
Physical Description
plastic (overall material)
steel (overall material)
rubber (overall material)
overall: 22.3 cm x 22.3 cm x 34.3 cm; 8 25/32 in x 8 25/32 in x 13 1/2 in
ID Number
accession number
catalog 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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