According to a 1945 IBM brochure, of the many basic units of the ASCC that were developed or invented by IBM engineers, the more important elements and their developers were:
- Unit counter construction and the means for electrically resetting counters, invented by Fred M. Carroll in 1925.
- Commutator total-taking mechanism, invented by George F. Daly in 1926.
Hamilton and Harvard's Dr. Howard Aiken collaborated in developing circuits used to compute such functions as logarithms, sines, and cosines. The circuits which correlated the operations of the ASCC into one single working unit were designed by Hamilton and Durfee. In the early stages of the project, Aiken, who was later called to active duty in the U.S. Navy, spent the major portion of the summers of 1939 and 1940 at Endicott assisting IBM's engineers with the development.