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<p>Between 1884 and 1930, the city of Chicago emerged as a center of manufacture for a new kind of machine, designed especially to assist in ordinary addition. Chicago inventions and products would shape the adding machine industry into the second half of the 20th century.</p>
Peggy Aldrich Kidwell, "'Yours for Improvement'-The Adding Machines of Chicago, 1884-1930", IEEE Annals of the History of Computing, vol. 23, no. , pp. 3-21, July-September 2001, doi:10.1109/85.948903
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