In the United States, further differential analysers were built at the Ballistic Research Laboratory in Maryland and in the basement of the Moore School of Electrical Engineering at the University of Pennsylvania during the early 1940s.
W Stanach Zjednoczonych, kolejne analizatory różnicowe powstały w Laboratorium Badań Balistycznych w Maryland oraz w podziemiach Moore School of Electrical Engineering, na Uniwersytecie Pensylwanii we wczesnych latach 40.