Burroughs Adding Machine

This full-keyboard printing electric adding machine adds numbers with as many as 13 digits and prints 13-digit results. It is tan and brown and has 13 columns of square plastic digit keys, with nine keys in each column. There also are five function keys and bars labeled “+” and “-”. The sides, front, and back of the case are missing. A narrow printing mechanism at the top of the machine has a ribbon and paper tape. It has 15 type bars. The first two print special characters and the rest print digits.
The machine is marked: Burroughs P 402 Elec. (/) A9103-20 (/) Date-Count-Normal (/) Rack #E Shelf 2. It is model #282 from the collection of the Patent Division of Burroughs Corporation.
Currently not on view
Object Name
adding machine
date made
ca 1950
Burroughs Adding Machine Company
Physical Description
plastic (overall material)
metal (overall material)
paper (overall material)
overall: 26.5 cm x 32 cm x 39.5 cm; 10 7/16 in x 12 19/32 in x 15 9/16 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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