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:
- Multiplying machine, invented by James W. Bryce in 1934.
- Dividing machine, invented by Bryce in 1936.
- Multiplying dividing machine, a combination of the two devices cited above in a single machine using the same mechanisms for both functions, invented by Bryce and A. Halsey Dickenson in 1937.
- Unit counter construction and the means for electrically resetting counters, invented by Fred M. Carroll in 1925.
- Ratchet type plate counter, invented by Lake and Wesley Pfaff in 1935.
- Pluggable type relay, invented by Lake and Pfaff in 1937.
- Double-deck card feed, invented by Lake in 1921.
- Electromatic Typewriter, invented by James F. Smathers in 1921 and acquired by IBM in 1933, and further developed for automatic operation by Lake and Frank Hamilton in 1936.
- Counter readout and emitter, invented by Bryce in 1928.
- 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.