Burroughs Series P Adding Machine

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This full-keyboard printing adding machine has a steel mechanism and off-white and gray-brown plastic keys. There are ten columns of color-coded digit keys. Right of these is a column of function keys. On the far right are addition and subtraction bars. The ribbon, printing mechanism, and narrow carriage are at the back of the machine, with a serrated edge for tearing the paper tape. The machine has no case. Wiring is present but no cord. The machine has 11 type bars.
A red paper tag attached to the object reads: PATENT DEPT. (/) #345. A metal tag reads: 3531-2. Another metal tag reads: DONATED TO (/) The Smithsonian Institution (/) by (/) Burroughs Corporation.
This object was model #345 in the collection of the Patent Division of Burroughs Corporation.
Currently not on view
date made
ca 1950
Burroughs Adding Machine Company
place made
United States: Michigan, Detroit
Physical Description
plastic (overall material)
metal (overall material)
overall: 20.5 cm x 24 cm x 32.5 cm; 8 1/16 in x 9 7/16 in x 12 25/32 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


"En 1962, en Mendoza Argentina, siendo técnico de Burroughs reparaba estas maquinas, y fui progresando, en el año 1976 me retiré y ya atendia computadoras B2500."

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