Adding Machine Section, Burroughs Model 903

This is one of a series of adding machines and adding machine models prepared by the Patent Department of the Burroughs Adding Machine Company. It is a steel mechanism for part of a key-driven adding machine. There are a one column of nine octagonal white plastic keys and two numeral wheels with black plastic rim. Keys for odd digits are concave, and for even digits, flat. Complementary digits are indicated on the keys. According to the accession file, this is an invention of Walter J. Pasinski. It compels a full stroke on keys.
A metal tag attached to the object reads: B.A.M.CO. (/) MODEL (/) No. 903.
Objects 1982.0794.04 through 1982.0794.10 received together as Burroughs Patent model 42.
Currently not on view
Object Name
adding machine model
date made
ca 1920
Burroughs Adding Machine Company
Physical Description
plastic (overall material)
steel (overall material)
overall: 13.5 cm x 5.4 cm x 26.6 cm; 5 5/16 in x 2 1/8 in x 10 15/32 in
place made
United States: Michigan, Detroit
ID Number
accession number
catalog 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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